 Caenagnathids also tended to be more lightly built than the oviraptorids.They had slender arms and long, gracile legs, although they lacked the extreme cursorial specializations seen in avimimids and "Caudipteryx".The name "Caenagnathus" (and hence Caenagnathidae) means "recent jaws"—when first discovered, it was thought that caenagnathids were close relatives of paleognath birds (such as the ostrich) based on features of the lower jaw.