beast of prey
 猛獸,食肉
 Prey n.  Anything, as goods, etc., taken or got by violence; anything taken by force from an enemy in war; spoil; booty; plunder.
    And they brought the captives, and the prey, and the spoil, unto Moses, and Eleazar the priest.   --Num. xxxi. 12.
 2. That which is or may be seized by animals or birds to be devoured; hence, a person given up as a victim.
    The old lion perisheth for lack of prey.   --Job iv. ii.
    Already sees herself the monster's prey.   --Dryden.
 3. The act of devouring other creatures; ravage.
    Hog in sloth, fox in stealth, . . . lion in prey.   --Shak.
 Beast of prey, a carnivorous animal; one that feeds on the flesh of other animals.