http://www.bbc.com/news/technology-34129490

An autonomous starfish-killing robot is close to being ready for trials on the Great Barrier Reef, researchers say.

Crown-of-thorns starfish have have been described as a significant threat to coral.

The Cotsbot robot, which has a vision system, is designed to seek out starfish and give them a lethal injection.

After it eradicates the bulk of starfish in a given area, human divers can move in and mop up the survivors.