The Sunflower Star is a starfish with up to 26 arms -and it can grow up to a meter wide! Those little waving "feet"? It can have up to 15,000 of those, which they use to draw its prey near enough to eat. The Vancouver Aquarium tells us how it eats:
The sunflower star also uses those tube feet to pry a live clam (its favourite food) apart before pushing its stomach out of its mouth and inside the clam, digesting the hapless clam in its own shell (the sunflower star digests its food outside of its body).