The most voracious predator in West Coast waters, from Alaska to California, is not the octopus, the killer whale or even the shark. It’s the sunflower star (Pycnopodia helianthoides), which will eat almost anything in its path, whether it’s a clam, sea urchin or a dead duck!
Nicole Cann, manager of interpretive delivery, chose the sunflower star to highlight for October’s Staff Pick of the Month because it’s an animal she got to know when she first started as a volunteer seven years ago. As part of her volunteer duties, Nicole regularly put on a Critter Corner program called “Predator Versus Prey,” which required her to demonstrate how the sunflower star eats.
She says, “They look so cool and yet have deceptively simple bodies that are so different from our own. They’re also incredibly successful predators. It’s amazing!”
The sunflower star is the largest sea star in the world – growing up to one metre wide – and is the heaviest at five kilograms (about the weight of a bag of potatoes). It’s also the fastest animal on the ocean bottom, crawling almost two metres a minute, which may not seem that fast to us but is speedy if you’re a clam just chillin’ on the sand.
And because this sea star is best described with superlatives, you’ll be interested to know that it can have up to 26 arms (unlike the measly five of other sea stars) and 15,000 tube feet under them. No wonder it’s so speedy.
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).
Nicole says, “I think people are attracted to these alien-looking creatures but I don’t know if they truly understand how incredible these sunflower stars are!”
Well, now you do know just how incredible these unassuming spineless animals (invertebrates) are.