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King Island emu

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King Island emu
Adult and juvenile specimens, Muséum national d'Histoire naturelle, Paris

Extinct (1822)  (IUCN 3.1)[1]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Infraclass: Palaeognathae
Order: Casuariiformes
Family: Casuariidae
Genus: Dromaius
Species:
D. novaehollandiae
Subspecies:
†D. n. minor
Trinomial name
†Dromaius novaehollandiae minor
(Spencer, 1906)
Historical distribution of emu taxa (King Island emu in red) and ancient shorelines around Tasmania
Synonyms
List
  • Casuarius diemenianus Jennings,1827
  • Dromaeus parvulus Broderip, 1842
  • Dromaeus minor Spencer, 1906
  • Dromaius peroni Rothschild, 1907
  • Dromaius bassi Legge, 1907
  • Dromaius parvulus Mathews, 1910
  • Dromiceius spenceri Mathews, 1912
  • Peronista peroni (Mathews, 1913)
  • Dromaius diemenianus (Morgan & Sutton, 1928)

The King Island emu (Dromaius novaehollandiae minor) is an extinct subspecies of emu that was endemic to King Island, in the Bass Strait between mainland Australia and Tasmania. Its closest relative may be the extinct Tasmanian emu (D. n. diemenensis), as they belonged to a single population until less than 14,000 years ago when Tasmania and King Island were still connected. The small size of the King Island emu may be an example of insular dwarfism. The King Island emu was the smallest of all known emus and had darker plumage than the mainland emu. It was black and brown and had naked blue skin on the neck, and its chicks were striped like those on the mainland. The subspecies was distinct from the likewise diminutive Kangaroo Island emu (D. n. baudinianus) in a number of osteological details, including size. The behaviour of the King Island emu probably did not differ much from that of the mainland emu. The birds gathered in flocks to forage and during breeding time. They fed on berries, grass and seaweed. They ran swiftly and could defend themselves by kicking. The nest was shallow and consisted of dead leaves and moss. Seven to nine eggs were laid, which were incubated by both parents.

Europeans discovered the King Island emu in 1802 during early expeditions to the island, and most of what is known about the bird in life comes from an interview French naturalist François Péron conducted with a sealer there, as well as depictions by artist Charles Alexandre Lesueur. They had arrived on King Island in 1802 with Nicolas Baudin's expedition, and in 1804 several live and stuffed King and Kangaroo Island emus were sent to France. The two live King Island specimens were kept in the Jardin des Plantes, and the remains of these and the other birds are scattered throughout various museums in Europe today. The logbooks of the expedition did not specify from which island each captured bird originated, or even that they were taxonomically distinct, so their status remained unclear until more than a century later. Hunting pressure and fires started by early settlers on King Island likely drove the wild population to extinction by 1805. The captive specimens in Paris both died in 1822 and are believed to have been the last of their kind.

Taxonomy

There was long confusion regarding the taxonomic status and geographic origin of the small island emu taxa from King Island and Kangaroo Island, since specimens of both populations were transported to France as part of the same French expedition to Australia in the early 1800s. The logbooks of the expedition failed to clearly state where and when the small emu individuals were collected, and this has resulted in a plethora of scientific names subsequently being coined for either bird, many on questionable grounds, and the idea that all specimens had originated from Kangaroo Island.[2] Furthermore, in 1914, L. Brasil argued the expedition did not encounter emus on King Island, because the weather had been too bad for them to leave their camp.[3] The French also referred to both emus and cassowaries as "casoars" at the time, which has led to further confusion.[4]

1807 cartouche of a small emu and other birds from a map of south east Australia and Kangaroo Island

The French naturalist Louis Jean Pierre Vieillot coined the binomial Dromaius ater in 1817.[5] Various collectors found subfossil emu remains on King Island during the early 20th century, the first by the Australian amateur ornithologist Archibald James Campbell in 1903, near a lagoon on the east coast.[6][7] In 1906, the Australian ornithologist Walter Baldwin Spencer coined the name Dromaius minor based on some Pleistocene subfossil bones and eggshells found on King Island.[8] The Australian ornithologist William Vincent Legge also coined a name for these remains in 1906, Dromaius bassi, but at a later date.[9] In his 1907 book Extinct Birds, the British zoologist Walter Rothschild stated that Vieillot's description actually referred to the mainland emu, and that the name D. ater was therefore invalid. Believing the skin in Muséum national d'Histoire naturelle of Paris was from Kangaroo Island, he made it the type specimen of his new species Dromaius peroni, named after the French naturalist François Péron, who is the main source of information about the bird in life.[10]

The Australian amateur ornithologist Gregory Mathews coined further names in the early 1910s, including a new genus name, Peronista, as he believed the King and Kangaroo Island birds were generically distinct from the mainland emu.[11] Later writers claimed that the subfossil remains found on King and Kangaroo Islands were not discernibly different, and that they therefore belonged to the same taxon.[12][13] In 1959, the French ornithologist Christian Jouanin proposed that none of the skins were actually from Kangaroo Island, after inspecting expedition and museum documents.[14] In 1990, Jouanin and the French palaeontologist Jean-Christophe Balouet used environmental forensics to demonstrate that the mounted skin in Paris came from King Island, and that at least one live bird had been brought from each island.[15] All scientific names given to the Kangaroo Island emu were therefore based on specimens from King Island or were otherwise invalid, leaving it nameless. Based on later finds of subfossil material in 1984, the Australian ornithologist Shane A. Parker confirmed the separate geographic origin and distinct morphology of the King and Kangaroo Island emus. Parker named the Kangaroo Island bird Dromaius baudinianus, after Nicolas Baudin, the leader of the French expedition. The name Dromaius ater was kept for the King Island emu.[16]

There are few morphological differences that distinguish the extinct insular emus from the mainland emu besides their size, but all three taxa were most often considered distinct species. A 2011 study by the Australian geneticist Tim H. Heupink and colleagues of nuclear and mitochondrial DNA, which was extracted from five subfossil King Island emu bones, showed that its genetic variation fell within that of the extant mainland emus. It was therefore interpreted as conspecific with the emus of the Australian mainland, and was reclassified as a subspecies of Dromaius novaehollandiae, D. n. ater. Other animals present on King Island are also considered as subspecies of their mainland or Tasmanian counterparts rather than distinct species. The authors suggested that further studies using different methods might be able to find features that distinguish the taxa.[17] In its 2013 edition, The Howard and Moore Complete Checklist of the Birds of the World emended the trinomial name of the King Island emu to D. n. minor, based on Spencer's D. minor, on the ground that Vieillot's D. ater was originally meant for the mainland emu.[18] This rationale was accepted by the IOC World Bird List, which used D. n. minor thereafter.[19]

In 2014–2015, the English palaeontologist Julian Hume and colleagues conducted a search for emu fossils on King Island; no major palaeontological surveys had been done since the early 20th century, apart from discoveries made by a local natural historian (including of a unique eggshell) during the preceding thirty years. In 2014, Hume and colleagues found emu subfossils in Cape Wickham, but upon returning to the site in 2015, the area had been turned into a golf course, and the researchers were denied access to the site. They cautioned in 2018 that other fossiliferous sites on King Island were also under such threat, and highlighted the need to protect them. The researchers also identified an area near Surprise Bay where subfossils had been collected in 1906, but found it almost impossible to find more, since the area had been covered in grass in the meantime (the grass had previously been kept down by livestock).[6]

Evolution

Charles Alexandre Lesueur's 1807 plate of the head, wing and feathers of a possible King Island emu

During the Late Quaternary period (0.7 million years ago), small emus lived on a number of offshore islands of mainland Australia. In addition to the King Island emu, these included taxa found on Kangaroo Island (D. n. baudinianus) and Tasmania (D. n. diemenensis), all of which are now extinct. The smallest taxon, the King Island emu, was confined to a small island situated in the Bass Strait between Tasmania and Victoria, approximately 100 km (62 mi) from both coasts. King Island was once part of the land bridge which connected Tasmania and mainland Australia, but rising sea levels following the last glacial maximum eventually isolated the island. As a result of phenotypic plasticity the King Island emu population possibly underwent a process of insular dwarfism.[17] Emu eggshells were also identified from Flinders Island (in the opposite, eastern end of the Bass Strait) in 2017, possibly representing a distinct taxon.[6]

According to the 2011 genetic study, the close relation between the King Island and mainland emus indicates that the former population was isolated from the latter relatively recently, due to sea level changes in the Bass Strait, as opposed to a founding emu lineage that diverged from the mainland emu far earlier and had subsequently gone extinct on the mainland.[17] Models of sea level change indicate that Tasmania, including King Island, was isolated from the Australian mainland around 14,000 years ago. Up to several thousand years later King Island was then separated from Tasmania.[20] This scenario would suggest that a population ancestral to both the King Island and Tasmanian emu was initially isolated from the mainland taxon, after which the King Island and Tasmanian populations were separated. This, in turn, indicates that the likewise extinct Tasmanian emu is probably as closely related to the mainland emu as is the King Island emu, with both the King Island and Tasmanian emu being more closely related to each other. Fossil emu taxa show an average size between that of the King Island emu and mainland emu. Hence, mainland emus can be regarded as a large or gigantic form.[17]

A 2018 study by Australian geneticist Vicki A. Thomson and colleagues (based on ancient bone, eggshell and feather samples) found that the emus of Kangaroo Island and Tasmania also represented sub-populations of the mainland emu, and therefore belonged in the same species, D. novaehollandiae. They also found that the size of the island emus scaled linearly to the size of the islands they inhabited (the King Island emu was the smallest, while the Tasmanian was the largest), while time in isolation did not affect their size. This suggest that island size was the important driver in dwarfism of these emus, probably due to limitation in resources, though the exact effect needs to be confirmed. The little genetic differentiation between island emus indicates their dwarfism evolved rapidly and independently since they became islated form each other. King Island is 1100 km2, and was isolated from Tasmania for 12.000 years, while 62 400 km2 Tasmania was itself isolated from mainland Australia for 14.000 years. Kangaroo island is 4400 km2 and was isolated from the mainland 10.000 years ago.[21] A 2020 genetic study of the only known Kangaroo Island emu skin by the French ornithologist Alice Cibois and colleagues also supported retaining the three island emus as subspecies.[22]

Description

Size comparison between a human, the mainland emu, and the King Island emu

The King Island emu was the smallest type of emu and was about half the size of the mainland birds. It was about 87 cm (34 in) tall. According to François Péron's interview with a local sealer, the largest specimens were up to 137 cm (4.5 ft) in length, and the heaviest weighed 20 to 23 kg (45 to 50 lb). It had a darker plumage, with extensive black feathers on the neck and head, and blackish feathers on the body, where it was also mixed with brown.[12] The bill and feet were blackish, and the naked skin on the side of the neck was blue.[10] The 2011 genetic study did not find genes commonly associated with melanism in birds, but proposed the dark colouration could be due to alternative genetic or non-genetic factors.[17] Péron stated there was little difference between the sexes, but that the male was perhaps brighter in colouration and slightly larger. The juveniles were grey, while the chicks were striped like other emus. There were no seasonal variations in plumage.[12] Since the female mainland emus are on average larger than the males, and can turn brighter during the mating season, contrary to the norm in other bird species, some of these observations may have been based on erroneous conventional wisdom.[4]

Subfossil remains of the King Island emu show that the tibia was about 330 mm (13 in) long, and the femur was 180 mm (7 in) long. The pelvis was 280 mm (11 in) long, 64 mm (2.5 in) wide at the front, and 86 mm (3 in) wide at the back.[10] The tarsometatarsus averaged 232 mm (9 in) in length. In males, the tibiotarsus averaged 261 mm (10 in), whereas it averaged 301 mm (12 in) in females. In contrast, the same bones measured 269 mm (10.5 in) and 305 mm (12 in) in the Kangaroo Island emu. Apart from being smaller, the King Island emu differed osteologically from the Kangaroo Island emu in the intertrochlear foramen of the tarsometatarsus usually being fully or partially abridged. The outer trochlea was more incurved towards the middle trochlea in the Kangaroo Island bird, whereas they were parallel in the King Island emu.[16]

Comparison of the cranium contour in mainland (A, B, C) and King Island emus (D, E)

The King Island emu and the mainland emu show few morphological differences other than their significant difference in size. Mathews stated that the legs and bill were shorter than those of the mainland emu, yet the toes were nearly of equal length, and therefore proportionally longer. The tarsus of the King Island emu was also three times longer than the culmen, whereas it was four times longer in the mainland emu.[11] Additional traits that supposedly distinguish this bird from the mainland emu have previously been suggested to be the distal foramen of the tarsometatarsus, and the contour of the cranium. However, the distal foramen is known to be variable in the mainland emu showing particular diversity between juvenile and adult forms and is therefore taxonomically insignificant.[23] The same is true of the contour of the cranium, which is more dome-shaped in the King Island emu, a feature that is also seen in juvenile mainland emus.[17]

Behaviour and ecology

1893 illustration by John Gerrard Keulemans based on the Paris skin

Péron's interview described some aspects of the behaviour of the King Island emu. He wrote that the bird was generally solitary but gathered in flocks of ten to twenty at breeding time, then wandered off in pairs. They ate berries, grass and seaweed, and foraged mainly during morning and evening. They were swift runners, but were apparently slower than the mainland birds, due to being fat. They swam well, but only did so when necessary. They reportedly liked the shade of lagoons and the shoreline, rather than open areas. They used a claw on each wing for scratching themselves. If unable to flee from the hunting dogs of the sealers, they would defend themselves by kicking, which could inflict a great deal of harm.[24]

The English Captain Matthew Flinders did not encounter emus when he visited King Island in 1802, but his naturalist, Robert Brown, examined their dung and noted they had chiefly fed on the berries of Leptecophylla juniperina.[4] An account by English ornithologist John Latham about the "Van Diemen's cassowary" may also refer to the King Island emu, based on the small size described. In addition to a physical description, he stated that they gathered in groups of 70 to 80 individuals in a given location while foraging, behaviour that was exploited by hunters.[12] Hume and colleagues noted that most emu subfossils from King Island were found on the drier, leeward west coast of the island, and though probably due to preservation bias, they suggested that the emus were restricted to coastal and more open inland areas, and not found in the dense interior forests. An 1802 report by the English surveyor Charles Grimes also supported this, stating there were "plenty on the coast–but not inland". The tall, dense eucalypt forests of the island have since been destroyed.[6]

Péron stated that the nest was usually situated near water and on the ground under the shade of a bush. It was constructed of sticks and lined with dead leaves and moss; it was oval in shape and not very deep. He claimed that seven to nine eggs were laid always on 25 and 26 July, but the selective advantage of this breeding synchronisation is unknown. The female incubated the eggs, but the male apparently developed a brood patch, which indicates it contributed as well. The non-incubating parent also stayed by the nest, and the chicks left the nest two to three days after hatching.[12] The eggs were preyed upon by snakes, rats, and quolls.[25] Péron gave the incubation period as five or six weeks, but since the mainland emu incubates for 50 to 56 days, this may be too short. He stated a mother emu would defend its young from crows with its beak, but this is now known to be strictly male behaviour.[4]

Relationship with humans

Two small emus and other animals outside Château de Malmaison

The emus of King Island were first recorded by Europeans when a party from the ship Lady Nelson, led by the Scottish explorer John Murray, visited the island in January 1802. The bird was sporadically mentioned by travellers henceforward, but not in detail.[4] Captain Nicolas Baudin visited King Island later in 1802, during an 1800–04 French expedition to map the coast of Australia. Two ships, Le Naturaliste and Le Géographe, were part of the expedition, which also brought along naturalists who described the local wildlife.[12] François Péron, a naturalist who was part of Baudin's expedition, visited King Island and was the last person to record descriptions of the King Island emu from the wild.[17] At one point, Péron and some of his companions became stranded due to storms and took refuge with some seal hunters. They were served emu meat, which Péron described in favourable terms as tasting halfway "between that of the turkey-cock and that of the young pig".[4]

Péron did not report seeing any emus on the island himself, which might explain why he described them as being the size of mainland birds. Instead, most of what is known about the King Island emu today stems from a 33-point questionnaire that he used to interview a local English sealer, Daniel Cooper, about the bird. In accordance with a request by the authorities for the expedition to bring back useful plants and animals, Péron asked if the emus could be bred and fattened in captivity, and received a variety of cooking recipes. Péron's questionnaire remained unpublished until 1899, and very little was therefore known about the bird in life until then.[4]

Transported specimens

Skeleton in the Royal Zoological Museum, Florence, with reconstructed bones

Several emu specimens belonging to the different subspecies were sent to France, both live and dead, as part of the expedition. Some of these exist in European museums today. Le Naturaliste brought one live specimen and one skin of the mainland emu to France in June 1803. Le Géographe collected emus from both King and Kangaroo Island, and at least two live King Island individuals, assumed to be a male and female by some sources, were taken to France in March 1804. This ship also brought skins of five juveniles collected from different islands. Two of these skins, of which the provenance is unknown, are presently kept in Paris and Turin; the rest are lost.[12] In addition to rats, cockroaches, and other inconveniences aboard the ships, the emus were incommoded by the rough weather which caused the ships to shake violently; some died as a result, while others had to be force fed so they did not starve to death. In all, Le Géographe brought 73 live animals of various species back to France.[25]

The two individuals brought to France were first kept in captivity in the menagerie of Empress Josephine, and were moved to the Jardin des Plantes after a year.[4] The "female" died in April 1822, and its skin is now mounted in the Muséum national d'Histoire naturelle of Paris. The "male" died in May 1822, and is preserved as a skeleton in the same museum.[12] A feather of the Paris skin was given to the Tasmanian Museum and Art Gallery, the only confirmed feather belonging to this subspecies currently in Australia.[25] The Paris skin contains several bones, but not the pelvis, which is an indicator of sex, so the supposed female identity is unconfirmed. Péron noted that the small emus brought to France were distinct from those of the mainland, but not that they were distinct from each other, or which island each had come from, so their provenance was unknown for more than a century later.[4]

There is also a skeleton in the Royal Zoological Museum, Florence, which it obtained from France in 1833, but was mislabelled as a cassowary and used by students until correctly identified by Italian zoologist Enrico Hillyer Giglioli in 1900.[26] The skeleton is worn, and several elements are missing, some having been replaced with wooden copies (probably based on those of the Paris skeleton), including the pectoral girdle, the wings, and parts of the legs and skull. Its right metatarsus was damaged during life and had healed incorrectly.[27] It was thought to be a male (and incorrectly that of the Paris skin), but is now known to be a composite of two individuals. A fourth specimen was thought to be kept in the Liverpool Museum, but it may simply be a juvenile mainland emu.[12] Apart from the King Island emu specimens brought to France, a few are also known to have been brought to mainland Australia in 1803, but their fate is unknown.[4]

Contemporary depictions

1807 plate by Lesueur, perhaps showing this subspecies on the right

Péron's 1807, three-volume account of the expedition, Voyage de découverte aux terres Australes, contains an illustration (plate 36) of "casoars" by Charles-Alexandre Lesueur, who was the resident artist during Baudin's voyage. The caption states the birds shown are from "Ile Decrès", the French name for Kangaroo Island, but there is confusion over what is actually depicted.[12] The two adult birds are labelled as a male and female of the same species, surrounded by juveniles. The family-group shown is improbable, since breeding pairs of the mainland emu split up once the male begins incubating the eggs. Lesueur's preparatory sketches also indicate these may have been drawn after the captive birds in Jardin des Plantes, and not wild ones, which would have been harder to observe for extended periods.[4]

The Australian museum curator, Stephanie Pfennigwerth, has instead proposed that the larger, light-ruffed "male" was actually drawn after a captive Kangaroo Island emu, that the smaller, dark "female" is a captive King Island emu, that the scenario is fictitious, and the sexes of the birds indeterminable. They may instead only have been assumed to be male and female of the same species due to their difference in size. A crooked claw on the "male" has also been interpreted as evidence that it had lived in captivity, and it may also indicate that the depicted specimen is identical to the Kangaroo Island emu skeleton in Paris, which has a deformed toe. The juvenile on the right may have been based on the Paris skin of an approximately five-month-old emu specimen (from either King or Kangaroo Island), which may in turn be the individual that died on board le Geographe during rough weather, and was presumably stuffed there by Lesueur himself. The chicks may instead simply have been based on those of mainland emus, as none are known to have been collected.[4][6]

Extinction

1807 plate by Lesueur showing elephant seals and sealers (middle) on King Island

The exact cause for the extinction of the King Island emu is unknown. Soon after the bird was discovered, sealers settled on the island because of the abundance of elephant seals. Péron's interview with Daniel Cooper suggested that they likely contributed to the demise of the bird by hunting it, and perhaps by starting fires. Péron described how dogs were purpose-trained to hunt down the emus; Cooper even claimed to have killed no fewer than 300 emus himself.[17] Cooper had been on the island for six months, which suggests he killed 50 birds a month. His group of sealers consisted of eleven men as well as his wife, and they alone may have killed 3,600 emus by the time Péron visited them.[4]

Péron explained that the sealers consumed an enormous quantity of meat, and that their dogs killed several animals each day. He also observed such hunting dogs being released on Kangaroo Island, and mused that they might wipe out the entire population of kangaroos there in some years, but he did not express the same sentiment about the emus of King Island.[4] Based on the possibly restricted distribution of the emu to coastal areas, Hume and colleagues suggested this might explain their rapid disappearance, as these areas were easily accessible to sealers.[6] Natural fires may also have played a role.[12] It is probable that the two captive birds in France, which died in 1822, outlived their wild fellows on King Island, and were therefore the last of their kind.[2] Though Péron stated King Island "swarmed" with emus in 1802, they may have become extinct in the wild as early as 1805.[4] They were certainly extinct by 1836, when some English settlers arrived on the island. Elephant seals disappeared from the island around 1819 due to over-hunting.[6]

In 1967, when the King Island emu was still thought to be only known from prehistoric remains, the American ornithologist James Greenway questioned whether they could have been exterminated by a few natives, and speculated that fires started by prehistoric men or lightning may have been responsible. At this time, the mainland emu was also threatened by overhunting, and Greenway cautioned that it could end up sharing the fate of its island relatives if no measures were taken in time.[28]

References

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  23. ^ Patterson, C.; Rich, P. (1987). "The fossil history of the Emus, Dromaius (Aves: Dromaiinae)". Records of the South Australian Museum. 21 (2): 85–117. OCLC 156775809.
  24. ^ Milne-Edwards, M.; Oustalet, E. (1899). "Note sur l'Émeu noir (Dromæs ater V.) de l'île Decrès (Australie)". Bulletin du Muséum d'Histoire Naturelle (in French). 5: 206–214.
  25. ^ a b c Pfennigwerth, S. (2013). "New Creatures Made Known: Some Animal Histories of the Baudin Expedition" (PDF). In West-Sooby, J. (ed.). Discovery and Empire: The French in the South Seas. University of Adelaide Press. pp. 172–213. ISBN 9781922064523.
  26. ^ Giglioli, H. H. (1900). "A third specimen of the extinct Dromaius ater, Vieillot; found in the R. Zoological Museum, Florence". Nature. 62 (1596): 102. Bibcode:1900Natur..62..102G. doi:10.1038/062102a0. S2CID 3963420.
  27. ^ Giglioli, H. H. (1901). "On a specimen of the extinct Dromaeus ater discovered in the Royal Zoological Museum, Florence". Ibis. 43: 1–10. doi:10.1111/j.1474-919X.1901.tb07516.x.
  28. ^ Greenway, J. C. (1967). Extinct and Vanishing Birds of the World. New York: American Committee for International Wild Life Protection 13. pp. 141–144. ISBN 978-0-486-21869-4.
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