Full grown coconut crabs have been known to grow as large as 6-feet in length. The massive arthropods – which can weigh as much as 30 pounds – cannot swim, but can climb trees and are strong enough to crack open the tree-fruit that gives them their name.

Related Story: One theory about the coconut crab surmises that they were directly responsible for the death of famed pilot Amelia Earhart.

[Source: Environmental Graffiti. See previous Numbers of the Day here.]