I "GNU" the answer to this once upon a time...
Pig
Dog
Bat
Rat
Cat
Fox
Cow
Dog, cat, pig, cow, fox.....there should be many more. :)
dog, cat, rat, bat, pig
RAT
A three letter bird is an owl.
The Moa, a large flightless bird, hunted to extinction my the Maoris.
auk
Emu.
emu
emu
Auk
LEK
tit
Auk
Emu
Coo