Skip to Content
Read your mailRead your mail
Read your mailRead your mail
View the ForumsView the Forums
See your SalarySee your Salary
Access your bank accountAccess your bank account
Access your satchelAccess your satchel
Visit your houseVisit your house
Safety ToolsSafety Tools
Whyville TimesWhyville Times
Change your account settingsChange your account settings
Report a bug in WhyvilleReport a bug in Whyville
Confused? Click hereConfused? Click here
Crown-of-Thorns Sea Star
Acanthaster planci
40 cm

Where Crown-of-Thorns Sea Stars are found. Map from GBIF.
Count Log
You have not counted me yet. Visit the South Reef or North Reef , grab a tricoder, and click on me!

Encyclopedia of Life
Visit this species on the Encyclopedia of Life to find out more!
I am an echinoderm. Echinoderm means "spiny skin". The sea urchins on WhyReef are also echinoderms, but they don't have long arms and look more like pin cushions. I am way cooler, especially when I crawl around on the reef using my tube feet. I have hundreds of these little tube feet on the bottom of my body. I can only see changes between light and dark, my eyes don't see in color and they don't pick out shapes. But, I have an eyespot and the end of each of my arms --this means I can see in front, to the sides and behind me all at once! It's awesome!
Fun Facts
Don't call me a starfish. I am a Sea Star...and I am one of the largest ones on the reef! I can grow to almost 16 inches (40cm) across. I also have sharp spines to protect me from predators and I can have up to 19 arms, so I am WAY more ferocious than those other 5-armed (puny!) sea stars. I usually win my fights, but some times I lose arms in my epic battles with other reef creatures. When that happens, I just re-grow it! This is something that all sea stars can do.
I only eat other animals, so I'm a carnivore. But I only eat one kind of animal: corals! Corals are soooo very tasty, but most Whyvillians think my table manners are gross. I don't get it; all I do is spit out my stomach onto the coral, digest the coral outside of my body and then I suck up the liquid. That's not gross, right?
I can be dangerous to a reef. I can eat entire coral colonies, and I am always hungry. All by myself I can eat 13 square miles (33.7 sq km) of coral a year! If there are too many of us on a reef we can destroy it. Have you played the mini-Food Web Game with me in it? You can find out who eats me!