https://medium.com/@ashleybraun/can-killer-robots-help-save-the-great-barrier-reef-8805d125d321

I spot one on a clear September morning, while swimming through the lukewarm waters around the Great Barrier Reef. A striking starfish, the color of cabernet and sporting more than a dozen arms, hugs the side of a gently curving ridge of coral. It looks lovely and dangerous, and not just because I know the long spines covering it are lacquered with venom.

This creature, located a two-hour boat ride from Townsville, off Australia’s northeast coast, is known as the crown-of-thorns starfish. While it’s the first one I have ever seen, it’s far from alone. Since 2010, a plague of them, numbering somewhere in the millions, has been methodically consuming the Great Barrier Reef, representing yet another in a series of existential threats to a coral reef system already wounded by intense hurricanes and weakened by bouts of exceptionally warm waters.