What is wood pecker finch?

The woodpecker finch is a type of bird endemic to the Galapagos Islands. It is known for its unique adaptation of using twigs and cactus spines to extract insects from crevices in trees and bark. It also has a distinctive hammering sound, which it uses to communicate with other woodpecker finches. The woodpecker finch is roughly 13 cm in length, and its plumage varies from dark brown to black, with white spots on its back. It is a popular subject of study among evolutionary biologists, as its unique behavior and anatomy provide important insights into the adaptive radiation of Darwin's finches.