The Crown-of-Thorns Starfish, Acanthaster planci, moves slow but leave a path of devastation behind it. This is one of the largest sea stars in the world. These reef invaders feed on the hard surface of coral reef in search of reef polyps.
The sea star moves its stomach out of its mouth, the length of its body then attaches to the reef. The stomach of the sea star secretes a digestive enzyme that liquifies the coral tissue, so the sea star can ingest essential nutrients.
This robs the coral reef the ability to survive and when a n outbreak occurs these sea stars can devastate coral beds.