For decades, scientists believed the nine-pound coconut crab ate, well, coconuts. But in March 2016, biologist Mark Laidre watched one catch, kill and devour a red-footed booby. He described the encounter in a paper published in Frontiers in Ecology last week.
Why it matters: Fairly little is known about coconut crabs, including their diet. Researchers found islands in the Pacific and Indian oceans with lots of the crabs had few ground-nesting birds, and those with lots of birds had no crabs. Since ground-nesting birds are very vulnerable to predators, it's possible voracious coconut crabs influence the distribution of these birds.