Coral competitor becomes ally in fight against starfish
![crown-of-thorns starfish](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/08/wt_crownofthornsstarfish_free.jpg?fit=860%2C460&ssl=1)
An outbreak of crown-of-thorns starfish (one shown) can devastate a reef. But algae, a coral competitor, may protect coral from the predatory starfish, a new study finds.
mattk1979/Flickr (CC-BY-SA 2.0)