For animals, how about a phalarope?
It's a bird family that inhabits the Canadian Arctic, their Latin name means "coot" and "foot".
When they feed they swim in a small rapid circle and make a whirlpool.
Also, they are rare and interesting in that they display a sort of reverse sexual dimorphism. The females are larger and fancier than the males and they fight with other females over male mates. The males perform all of the incubation and chick care while the female tries to find more males to mate with!