The Common Starfish (Asterias rubens) can do things not many of us would attempt. Having smelled its target, say a mussel, it prizes the bivalve apart with its feet, squirts its own stomach out through its mouth, inserts a bit of stomach into the mussel shell and sucks out the contents for lunch. If it loses one of its five arms in the process, it can grow a new one. A female will expel 2.5 million eggs into the sea to await the male’s contribution of sperm and the resulting larvae will take a few weeks to look like starfish. To follow this up, have a look here.
Photograph of Asterias rubens (and gull) courtesy of Wikipedia.