This is a bit larger than the famous Crown-of-thorns starfish, which lives on coral polyps.

It only feeds on coral polyps, and usually at night.

An accumulation of as little as 1 mm may kill coral polyps.

However, most species feed on coral polyps and sea anemones.

Its parts were not independent members of a colony, like coral polyps.

In the wild, its diet consists of coral polyps.

The eggs and fish that hatch from them provide food for the coral polyps.

Most healthy coral polyps have algae living inside them.

If the algae die, the coral polyps may die, too.

The felt has been hand blocked into cups representing coral polyps.