a bird.
a penguin
A common diving bird is the puffin. It can dive up to 60 meters underwater in search of fish.
A pelican is a type of fish-eating ocean-diving bird with webbed feet.
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
peregrine falcon
A grebe.
Auk
grebe
One black and white diving bird is an auk, which includes puffins, guillemots, and razorbills. Another black and white diving bird is a murre.
Officially, a mallard is a dabbling duck, which is a duck that feeds or "dabbles" at the surface of the water, not diving. A simpler answer would be to call it a swimming bird.
A booby bird is a marine bird similar to a gannet, in the genus 'Sula'. It catches it fish by diving underwater and pursuing the fish.