Buffleheads. Anyone eat them?

[Rockyman41]

I'm new to water fowling.

I don't have permission on any fields yet or a blind and decoys yet so I have been taking advantage of some afga land on the side of a pothole lake. I have had a little success with mallards and have seen a few geese. What I have seen in very large numbers are what I believe are buffleheads. The lake is covered with them.

Are they worth shooting? They seem small but a few of them would beat the one mallard I've got so far.

On a side note: what is the best waterfowl pocket reference book? I have been using my hunters ed book at the field and google at home to help Id what I have been seeing.