[CarolinaGuitarman]

"But I think penguins are birds who are able to live in an extreme environment by flying underwater."

We like to call it swimming.

[SalukiLawyer]

"But I think penguins are birds who are able to live in an extreme environment by flying underwater." We like to call it swimming.

When you see a bird do that underwater, I think "flying underwater" is a more interesting way of expressing it, but perhaps I am so ignorant I don't know the difference between the use of the words "fly" and "swim" and so all of this science-stuff is simply going to be forever beyond me.