We have a LOT of red squirrels around here. They used to eat a lot of our birdseed, but when we started getting rats at our feeders, we invested in a new squirrel-proof feeder and a pole baffle for our old feeder. This frustrates the squirrels, but they can still eat seed that falls on the ground. They also manage to get at the suet feeder.
Judging by the, ahem, nipples, I am guessing this Mrs. Squirrel. Or perhaps she's a floozy Miss Squirrel? ;) She was mid-scurry up the pole to the suet.
I did have a very nice peanut feeder for the squirrels, with a lid they had to flip up. It was cute watching them figure it out. Then some bad-ass squirrel chewed a bit huge hole in the wooden lid. End of squirrel feeder.
And here's another squirrel (or the same squirrel; who knows?) dining on the birds' cast-offs.