The Warbler Finch was originally thought to be a warbler due to its thin and weak bill. But it is indeed part of the Darwin’s Finches, a group that is almost defined by bill variations and their role in influencing how we view evolutionary change. The Warbler Finch is the smallest of the Darwin’s Finches, and indeed the one with the thinnest bill. They come in two forms, and these two forms are genetically quite different and are suggested to be two separate species by some taxonomic bodies. One group is restricted to forest in the larger islands and is greener in body coloration; the other group is found in shrubby, dry thickets in small islands, and is greyer and duller looking. Some males of the greener forest subspecies also show a distinctive peachy wash to the face.