Kauai akialoa

The Kauaʻi ʻakialoa (Akialoa stejnegeri) was a Hawaiian honeycreeper in the subfamily Carduelinae of the family Fringillidae. It was endemic to the island of Kauai, Hawaii. It became extinct due to introduced avian disease and habitat loss. The Kauaʻi ʻakialoa was about seven and a half inches in length and had a very long downcurved bill, which covered one third of its length. The adult males were bright olive-yellow on top and yellow on the bottom. The throat, breast, and sides of the body were olive-yellow. The females, however, were green-gray above and had a shorter bill. The Kauaʻi ʻakialoa was believed to have survived in forests above 1,148 feet (350 m) above sea level, but has been observed frequently flying to the lower elevations of the island. This once very rare and unique bird used its long curved bill to reach the nectar of lobelias and ʻohiʻa blossoms. It also eats insects from under tree bark and from under mats of lichens and moss on trees.