Ankle-Biters are feathered reptilian creatures, native to the Tartarian Amazon forest. They are similar to crows in behavior. Ankle-Biter have a strange obsession with shiny things, which they use to attract mates and will attempt to knock over and loot anyone or anything carrying something shiny. These creatures are about the size of a rooster, similar in shape to a bird, albeit wingless. Their brown and green feathers allow them blend with their surroundings.

They have a diet of small mammals and insects.

Ankle-Biters appear similar to the Gastornis, despite not being birds.