West
You have the legs of a bird with wings outspread, landing in the mouth of her nest to rest. And when does she go back to rest? When the sun sets in the west! Imagine all the birds flying home as the sun sets. That's why this radical means west.
You could also see this as pi coming out of a mouth. Why would a mouth be talking about pi? Probably to figure out the curvature of the sun's path as it moves across the sky — to the west, always to the west!