Quote from Puredarkness
Your texture/ resource pack is messed up. Try reloading or reinstalling the texture/ resource pack.
THIS IS AN ACTUAL ANSWER.
I ran into another chicken and its texture was fine.
Quote from Littlebuch
Why won't it work?
Quote from ToastedTaquitos
If they have the time to add things almost every week, why don't they patch bugs instead of new things?