The woodpecker finch (Camarhynchus pallidus) is a monomorphic species of bird in the Darwin's finch group of the tanager family, Thraupidae endemic to the Galapagos Islands. The diet of a woodpecker finch revolves mostly around invertebrates, but also encompasses a variety of seeds. Woodpecker finches, like many other species of birds, form breeding pairs and care for young until they have fledged. The most distinctive characteristic of woodpecker finches is their ability to use tools for foraging. This behaviour indicates that they have highly specialized cognitive abilities. Woodpecker finches have also shown the ability to learn new behaviours regarding tool use via social learning. Not all populations of woodpecker finches use tools equally as often, as this is influenced by the environment in which they live. Description Woodpecker finches range in weight from 23g to 29g and are about 15 cm long. Although their tongues are quite short, they have a relatively long bill compared to other species of Darwin's finches. Distribution Woodpecker finches are native to the Galapagos Islands. They are commonly found on the islands of Isabela, Santa Cruz, San Cristobal, Fernandina, Santiago, and Penzón. They occupy all areas of the islands, from the most arid zones to more humid zones. However, the density of woodpecker finches is greater in the more humid zones than in the drier ones. Woodpecker finches are also found at a variety of altitudes, from sea level to higher inland elevations. They are a not a migratory species and when they do fly, they only fly short distances. Diet Woodpecker finch diets mainly consist of arthropods found in and around crevices in trees. They eat both adult insects and larvae, which are often located within trees and shrubs. Their habit of pecking at branches is similar to a woodpecker's drumming on a tree trunk. Wood-boring beetle larvae are a staple of their diet. They also often feed on moths, caterpillars and crickets. Another significant part of their diet includes fruit and seeds, making woodpecker finches important dispersers. Foraging behaviour One of the most distinguishable traits of Camarhynchus pallidus is its ability to use a twig, stick, or cactus spine as a tool. This behaviour earned it the nicknames tool-using finch, and carpenter finch. The finch manipulates the tool to dislodge invertebrate prey, such as grubs, from crevices in trees. It has been hypothesized that due to the absence of woodpeckers, woodpecker finches filled