Birds' feet are classified as anisodactyl, zygodactyl, heterodactyl, syndactyl or pamprodactyl. The legs are dark-brown, with zygodactyl toes. They share the zygodactyl feet of the parrot family. Roadrunners have four toes on each zygodactyl foot; two face forward, and two face backward. Bills are olive grey and legs blueish-grey, with zygodactyl toes. Roadrunners and other members of the cuckoo family have zygodactyl feet.