theropods from the Cretaceous Period.
Their arms are unusual in that in all genera except the most primitive, Haplocheirus, have rediculously short arms with 1-3 fingers and 1-3 claws.
Alvarezsaurs had beaks on their mouths. They had a lot of really small teeth.
Taxonomy and Genera
- ===Superfamily Alvarezsauroidea===
- ===Family Alvarezsauridae===
- ===Subfamily Mononykines===