Ostrich

Ostriches are birds that appeared in the secret area of Turtle Woods in Crash Bandicoot 2: Cortex Strikes Back. If Crash jumps onto them quickly from the top while they're putting their head in the ground, Crash can access the higher boxes needed to get the clear gem. Due to their massive size, they can't be defeated, but the ostriches are harmless anyway. Crash must act quickly, however, or he will not be able to reach the higher boxes.

Trivia

 * Ostriches also appeared in the concept art from Crash Twinsanity.  They appeared in the unused harbor level picture. Later art shows Coco riding on one. They would have appeared in the Ostrich Cave. To get there, players would have had to get past the harbor.