Correct Answer: Peacock, Ostrich, Tortoise

Solution : The correct option is Peacock, Ostrich, Tortoise.

The tortoise lacks teeth and hence cannot rip or smash food. Tortoises have a beak-like structure instead of teeth, which have rough and pointed edges that are quite useful for biting.  Peacocks do not have teeth. They have beaks instead of teeth since they are birds. Furthermore, because ostriches lack teeth, they ingest stones that aid in the grinding of their food once it enters the gizzard.