Adaptation
Woodpeckers have zygodactyl feet. These feet have four toes, the first and the fourth face backward, and the second and third face forward. This foot arrangement is good for grasping the limbs and trunks of trees. Members of this family can walk vertically up a tree trunk. In addition to the strong claws and feet, woodpeckers have short strong legs. This is typical of birds that forage on trunks.