Cormorant

Description:

Medium-to-large seabirds; All are fish-eaters, dining on small eels, fish, and even water snakes. They dive from the surface, though many species make a characteristic half-jump as they dive, presumably to give themselves a more streamlined entry into the water. Under water they propel themselves with their feet. Some cormorant species have been found, using depth gauges, to dive to depths of as much as 45 metres. (wikipedia)

Habitat:

swimming, diving, flying, chilling in flocks xD

Notes:

I saw a huge flock all floating on Lake Champlain. Then they all took of at the same time!