Great Barrier Reef
The hungry critters are eating away at the reef and there's no good way to get rid of them.
But it can still be saved, scientists said.
Greenpeace said listing the World Heritage Site as endangered would have forced the Australian government to act on climate change.
An ongoing study of their welfare delivers its latest alarming finding.
Two thirds of the coral reef—designated a world heritage site—have been damaged, according to aerial surveys.
Watch out, crown-of-thorns starfish.
Australia’s Reef is home to more than 6,000 species.