Parakeet not using his foot?

by Madison
(Nebraska)

Okay, so the other night, my parakeet, Artemis, managed to get out of my room. Thus, being attacked by my cat. I threw the cat outside, and got my poor bird, whom was hiding behind a couch. But he hasn't been using one of his feet... is it broken or something? I can't really afford to go to a vet, but the nearest vet specializes in livestock...