"Egg Stealer" is a term used in The Land Before Time for dinosaur species that primarily eat eggs. Ozzy and Strut, the villains of The Land Before Time II: The Great Valley Adventure, are named examples of Egg Stealers in the series.
Egg Stealers first appear in the original The Land Before Time, where one unsuccessfully attempts to steal the egg which Littlefoot hatches from shortly afterwards. They also appear in the sequence depicting the Great Earthshake, attempting to flee the devastation wrought by calamitous event.
In The Land Before Time IV: Journey Through the Mists, an egg stealer flock jumps into a river after the Prehistoric Pals first reach the Land of Mists. This marks the final appearance of any egg stealers in the series.