"The winter diet of brant consists mainly of eelgrass, but includes sea lettuce and
sea cabbage. The summer diet includes grasses, algae, mosses, other plants, and
marine invertebrates."

OK. To learn more about this red-footed duck, I read a general reference on
Google and the above phrase. I hadn't seen the word brant before, so looked it up.
It means a type of goose. The merganser is a duck. So why is that word brant there?
Beats me. I'll go look up the url to the article and past it below in a minute.

http://www.ducks.org/waterfowling/gallery/index.asp?duck=79