Cormorants

Cormorants are expert divers. Some dive as deep as 45 metres (150 feet). They speed along underwater via their webbed feet, using their wings as rudders.
Some colonies of cormorants have been observed herding fish for more efficient hunting.
Cormorants have relatively short wings due to their need to swim. Because of this, they expend more energy in flight than any other flying bird.
The name “cormorant” is a contraction of the Latin words corvus and marinus, which taken together mean “sea raven.”
All versions of the cormorant have glands that secrete oil used for keeping their feathers waterproof. However, this gland is not sufficient on its own, so cormorants are often seen spreading their wings to dry them.
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