The Mutant Bird is a bird that Dr. Animo mutated useing his Transmodulator.
The bird is now way bigger then normal. His eyes are big and red, and he is all grey. His tail is more yellowish same with the hair on his head.
Being a bird, he is a very good flyer and can fly as high as he wants.
He makes one appearance in Ben 10 in the episode Washington B.C. He has it in for Gwen since he mainlyonly has been attacking her. At the end of the episode the bird returns back to normal and tries to kiss up to Gwen but she still hates the bird.