I have to agree with the posts about the animation... I saw those pictures of the rendered bird and they were freakin awesome... but when I saw the animation I was disapointed by the bad movement described by everyone here...
It looks like you didnt have a reference movie and maybe just watched birds... it does look very stiff... the main part for me that look ed very good was the head movement when the bird was "cleaning its beak" ( I guess thats what he
s doing).
The birds also needs a spring like action to jump and fly then theres that slight drop due to not enough speed until it gain height and speed through flapping the wingies.