A crown-of-thorns starfish (Acanthaster planci) on a reef in the Marianas Islands. An “outbreak” of these coral-eating starfish can decimate a reef, and they have done great damage on Australia's Great Barrier Reef.
photo
Crown of Thorns Starfish
![Crown of Thorns Starfish in the Marianas Islands](/sites/default/files/styles/3_2_large/public/2023-11/CrownOfThornsOnReef750_2.jpg.webp?itok=ak37hDf5)