Lesser koa finch
| Lesser koa finch | |
|---|---|
| |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Passeriformes |
| Family: | Fringillidae |
| Subfamily: | Carduelinae |
| Genus: | †Rhodacanthis |
| Species: | †R. flaviceps
|
| Binomial name | |
| †Rhodacanthis flaviceps Rothschild, 1892
| |
The lesser koa finch (Rhodacanthis flaviceps) is an extinct species of Hawaiian honeycreeper in the subfamily Carduelinae of the family Fringillidae. It was endemic to the island of Hawaiʻi.[1]
Description
The only specimens of the lesser koa finch ever caught were a family group with members of different ages and genders, ideal for study.[2] The males were apparently golden-yellow with olive green on the breast and belly. The females were almost indistinguishable from the species' larger relative, the greater koa finch (Rhodacanthis palmeri), other than the fact that the former were slightly darker in color. The juveniles were somewhat mottled on the belly, similar to the females.
Distribution and habitat
The lesser koa finch was endemic to the island of Hawaiʻi. It inhabited montane koa (Acacia koa) forests.[1]
The IUCN Red List says, "This or a similar species is also known from the fossil record of O'ahu and Maui," citing a 1991 paper.[1] This apparently refers to the primitive koa finch (Rhodacanthis litotes), a similarly sized species known from fossils on Oʻahu and Maui, described as a new species in 2005.[3]
Behavior
Its life cycle and feeding habits apparently centered around the koa plant from which it got nectar and fruit (and for which it was named). The koa also provided refuge for small flocks of the finch as it avoided people and the noon high sun. It was seen congregating with its larger relative, the greater koa finch (Rhodacanthis palmeri).[citation needed] Several specimens were collected and sent to London, Cambridge, New York, Philadelphia, and Berlin.[citation needed]
Extinction
Last recorded in 1891. The most likely causes of its extinction are habitat destruction and avian malaria.[1]
When people brought cattle and created ranches in the koa forests, the younger koa trees began to be trampled by the cattle. The cattle also stripped the leaves off the trees at a faster rate than the leaves normally fell. The older trees were too tall to be defoliated, but their roots were kicked and pulled out, causing them to grow weak and eventually die. With the loss of the native koa trees the last birds began to die off. The bird was never seen after the year 1891.
Only eight specimens were collected, all of them from trees that were also used by the greater koa finch (Rhodacanthis palmeri).
References
- ^ a b c d e BirdLife International (2016). "Rhodacanthis flaviceps". IUCN Red List of Threatened Species. 2016: e.T22720745A94681389. doi:10.2305/IUCN.UK.2016-3.RLTS.T22720745A94681389.en. Retrieved 13 November 2021.
- ^ George C. Munro. (1944)
- ^ James, Helen F.; Storrs L. Olson (2005). "The diversity and biogeography of koa-finches (Drepanidini: Rhodacanthis) with descriptions of two new species" (PDF). Zoological Journal of the Linnean Society. 144 (4). Linnean Society of London: 527–541. doi:10.1111/j.1096-3642.2005.00173.x.
- Bryson, Bill. A Short History of Nearly Everything. 1st ed. 1 vol. New York, NY: Broadway Books, 2004. 476. Print.
- Munro, George C. Birds of Hawaii. ISBN 0-8048-0063-4