Mousebird

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Coliiformes
Urocolius macrourus-20090110B.jpg
Blue-naped mousebird (Urocolius macrourus)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Subclass: Neornithes
Infraclass: Neognathae
Superorder: Neoaves
(unranked): Strigimorphae
Order: Coliiformes
Murie, 1872
Family: Coliidae
Swainson, 1837
and see text
Genera

Colius
Urocolius
For fossil taxa, see text.

The mousebirds are a small group of (possibly near passerine) birds, which have no known close affinities to other groups, though might be close to trogons and owls.[1][2] The mousebirds are therefore given order status as Coliiformes. This group is confined to sub-Saharan Africa, and is the only bird order confined entirely to that continent. They had a wider range in prehistoric times and apparently evolved in Europe.

Description[edit]

They are slender greyish or brown birds with soft, hairlike body feathers. They are typically about 10 cm in body length, with a long, thin tail a further 20–24 cm in length, and weigh 45–55 grams.[3] They are arboreal and scurry through the leaves like rodents, in search of berries, fruit and buds. This habit, and their legs, gives rise to the group's English name. They are acrobatic, and can feed upside down. All species have strong claws and reversible outer toes (pamprodactyl foot). They also have crests and stubby bills.

Behaviour and ecology[edit]

Mousebirds are gregarious, again reinforcing the analogy with mice, and are found in bands of about 20 in lightly wooded country. These birds build cup-shaped twig nests in trees, which are lined with grasses. Two to four eggs are typically laid, hatching to give atricial young which develop quickly and soon leave the nest and acquire flight.

Systematics and evolution[edit]

The mousebirds could be considered "living fossils" as the 6 species extant today are merely the survivors of a lineage that was massively more diverse in the late Paleogene and Miocene. There are comparatively abundant fossils of Coliiformes, but it has not been easy to assemble a robust phylogeny. The family is documented to exist from the Early Eocene onwards; by the Late Eocene or earlier, two families are known to have existed, the extant Coliidae and the longer-billed prehistorically extinct Sandcoleidae.[4] The latter were previously a separate order,[5] but eventually it was realized that they had come to group ancestral Coraciiformes, parrots, the actual sandcoleids and forms like Neanis together in a paraphyletic assemblage. Even though the sandcoleids are now assumed to be monophyletic following the removal of these taxa, many forms cannot be conclusively assigned to one family or the other.[6] The genus Selmes, for example, is probably a coliid, but only distantly related to the modern genera.[7]

Genera[edit]

Order COLIIFORMES

  • Basal and unassigned forms (all fossil)
    • Genus Chascacocolius (Late Paleocene ?- Early Eocene) - basal? sandcoleid?
    • Genus Eocolius (London Clay Early Eocene of Walton-on-the-Naze, England) - sandcoleid or coliid
    • Genus Selmes (Middle Eocene ?-Late Oligocene of C Europe) - coliid? (synonym of Primocolius?)
    • Genus Limnatornis (Early Miocene of Saint-Gérand-le-Puy, France) - coliid? (Urocolius?) Includes "Picus" consobrinus
    • "Picus" archiaci (Early Miocene of Saint-Gérand-le-Puy, France) - Limnatornis? coliid? (Urocolius?)
    • Coliiformes gen. et sp. indet. (Late Miocene of Kohfidisch, Austria)[8]
    • Genus Eobucco - sandcoleid?
    • Genus Uintornis - sandcoleid?
  • Family Coliidae
    • Basal and unassigned forms (all fossil)
      • Genus Primocolius (Late Eocene/Oligocene of Quercy, France)
      • Genus Oligocolius (Early Oligocene of Frauenweiler, Germany)
      • Genus Masillacolius (Middle Eocene of Messel, Germany)
    • Subfamily Coliinae
      • Genus Colius (4 species)
      • The only known species of Necrornis (Milne-Edwards, 1871) (Middle Miocene of Sansan, La Grive-Saint-Alban, France) was redescribed by Peter Ballmann as Colius palustris in 1969.[9] This treatment was approved by Olson in 1985.[10]
    • Subfamily Urocoliinae
  • Family Sandcoleidae (all fossil)

Footnotes[edit]

  1. ^ McCormack et al. (2012)
  2. ^ Hackett et al. (2008)
  3. ^ Cunningham-Van Someren, G.R. (1991). Forshaw, Joseph, ed. Encyclopaedia of Animals: Birds. London: Merehurst Press. pp. 138–139. ISBN 1-85391-186-0. 
  4. ^ This is not a typographical error, but a Latinization of Sand Coulee River, where some fossils of Sandcoleus where found. In spoken English, "Coliidae" and "-coleidae" sounds very similar.
  5. ^ Houde & Olson (1992)
  6. ^ Mayr & Mourer-Chauviré (1999)
  7. ^ It has a peculiar foot morphology not found in any other bird, with very stubby toes. The specific name absurdipes ("absurd foot") refers to this. The genus name is an anagram of "Messel", where it was first found.
  8. ^ Similar to Urocolius and Limnatornis (if distinct): Mlíkovský (2002)
  9. ^ Peter Ballmann (1969): Les oiseaux miocènes de La Grive-Saint-Alban (Isère). – Géobios 2: p 157-204.
  10. ^ Storrs Olson (1985): The Fossil Record of Birds In: Avian Biology, No. 8: p. 79–238

References[edit]

External links[edit]