Western grebe
| Western grebe | |
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| Species: | A. occidentalis
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| Binomial name | |
| Aechmophorus occidentalis (Lawrence, 1858)
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| Range of A. occidentalis Breeding range Year-round range Wintering range
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The western grebe (Aechmophorus occidentalis[2]) is a species in the grebe family of water birds. Folk names include "dabchick", "swan grebe" and "swan-necked grebe".
Western grebe fossils from the Late Pleistocene of SW North America were described as a distinct species,[3] but later ranked as a paleosubspecies Aechmophorus occidentalis lucasi.[4] More recent study found them to fall within the variation now known to exist in today's birds.[5][6]
Description
The western grebe is the largest North American grebe. It is 55–75 cm (22–30 in) long, weighs 795–2,000 g (1.753–4.409 lb) and measures 79–102 cm (31–40 in) across the wings.[7][8][9] It is black-and-white, with a long, slender, swan-like neck and red eyes. It is easily confused with Clark's grebe, which shares similar features, body size, behavior and habitat, and hybrids are known.
The western grebe has black around the eyes and a straight greenish-yellow bill whereas the Clark's grebe has white around the eyes and an up-turned bright yellow bill. The downy young of Western are grey; Clark's downy young are white.
Subspecies
There are two subspecies of the western grebe:
- A. o. occidentalis, (Lawrence, 1858), western Canada & United States
- A. o. ephemeralis, (Dickerman, 1986), western Mexico
Breeding
Western grebes nest in colonies of hundreds on large inland lakes, sometimes using coastal marshes, in western North America. It has a spectacular courtship display; two birds will rear up and patter across the water's surface. Northern birds migrate west to coastal ocean in winter; birds in the southwest and Mexico may be permanent residents.
Food and feeding
This bird dives for carp, herring, mollusks, crabs, and salamanders.
References
- ^ Template:IUCN
- ^ Etymology: Aechmophorus, "spear-bearer", from Ancient Greek aichme (a spear) + phoros (one who bears something around), in reference to its bill; occidentalis: Latin for "western".
- ^ Miller, Loye H. (1911). "Additions to the avifauna of the Pleistocene deposits at Fossil Lake, Oregon". University of California Publications, Bulletin of the Department of Geology. 6: 79–87.
- ^ Howard, Hildegarde (1946). "A review of the Pleistocene birds of Fossil Lake, Oregon". Carnegie Institution of Washington Publications. 551: 141–195.
- ^ Jehl, Joseph R. Jr (1967). "Pleistocene Birds from Fossil Lake, Oregon" (PDF). Condor. 69 (1): 24–27. doi:10.2307/1366369. JSTOR 1366369.
- ^ Storer, Robert W. (1989). "The Pleistocene Western Grebe Aechmophorus (Aves, Podicipedidae) from Fossil Lake, Oregon: A comparison with Recent material" (PDF). Contributions from the Museum of Paleontology, University of Michigan. 27 (12): 321–326.
- ^ Western Grebe. All About Birds
- ^ CRC Handbook of Avian Body Masses by John B. Dunning Jr. (Editor). CRC Press (1992), ISBN 978-0-8493-4258-5.
- ^ Burnie D and Wilson DE (Eds.), Animal: The Definitive Visual Guide to the World's Wildlife. DK Adult (2005), ISBN 0789477645
Further reading
- Nuechterlein, Gary L. (May 1982). "The Birds That Walk on Water". National Geographic. Vol. 161, no. 5. pp. 624–637. ISSN 0027-9358. OCLC 643483454.
External links
- Western Grebe Species Account - Cornell Lab of Ornithology
- Western Grebe - Aechmophorus occidentalis - USGS Patuxent Bird Identification InfoCenter
- Stamps (for Canada) at bird-stamps.org
- "Aechmophorus occidentalis". Integrated Taxonomic Information System. Retrieved 24 February 2009.
- "Western Grebe media". Internet Bird Collection.
- Western Grebe photo gallery at VIREO (Drexel University)