Squeaks

Squeaks was one of the characters in The Fox and the Hound. Dinky and Boomer were trying to catch him all throughout the film, but by the end he had pupated and transformed into a butterfly and flew away.

The Fox and the Hound
Squeaks is a caterpillar who never seems to get a rest from Dinky and Boomer's restless hunt. The birds, who want to eat the caterpillar,? are constantly after him up until the last part of the movie when he transforms into a butterfly. Not only do the two birds not recognize him, but they cannot eat him anymore either, so he is happy he has nothing to run or hide from anymore.

He is characterized by his big eyes, and is recognized by that feature when he was both a caterpillar and a butterfly.