Starfish from the 1970s were found to have similar levels of microplastics as those from today.
Shoreline scavengers also found a host of other dead creatures.
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.
Watch out, crown-of-thorns starfish.
The iconic sea creatures are dying off, and no one knows why