Eaglenest

The Eaglenest is a small hedgehog-like or porcupine-like rodent that (as its name implies) has a hairy and prickly back which resembles a bird's nest. It is one of the many Croodaceous Creatures.

It was not featured in the final version of the film.

Trivia

 * The Eaglenest also resembles the knarl, a kind of magical hedgehog from Harry Potter, and maybe the possible concept for the franchise in the DreamWorks Animation adaption.