Ibis
The bird you are thinking of is a SWAN.
Mohawk
The Dodo Bird
Germany, the first four letters aren't a speciific disease but a germ is a disease carrying vector.
The dodo bird.
Xeme
'Wren'
erne
Some sea birds with four letters are: - Erne - Tern - Gull
There are many animals with just four letters. Here are a few examples, Lion, bird, mule, lamb, fish, frog, wren and duck.
HEART The first four letters 'hear' refer to the function of the middle three letters, 'ear.' The last three letters 'art' is stuff that you do.
lark, coot, dodo, wren