Auk
A grebe.
auk
King Bird. They swoop down to get their fish and fly back up. That's why on beer bottles it says kingfisher and shows a bird diving in the water
daw
a bird.
An Australian bid with three letters is the "emu".
Emu.
The Emu is a flightless bird with three letters in its name.
A common diving bird is the puffin. It can dive up to 60 meters underwater in search of fish.
The bird is a Moa. You can read more at: http://en.wikipedia.org/wiki/Moa Cheers!
a penguin
The emu.