Avimimus (/ˌeɪvɪˈmaɪməs/ AY-vi-MY-məs), meaning "bird mimic" (Latin avis = bird + mimus = mimic), is a genus of oviraptorosaurian theropod dinosaur, named for its bird-like characteristics, that lived in the late Cretaceous in what is now Mongolia, around 85 to 70 million years ago.