Recently, in Shoal Creek, Tennessee, researchers discovered a new, very large species of crayfish.
This crayfish, Barbicambasrus simmonsi, reaches a length of nearly five inches, is nearly twice the size of its local relatives, as you can see in this comparison shot.
The crayfish is also noted for its unusual "bearded" antennae, called 'setae.' These fancy antennae give this guy enhanced sensory abilities.
Pictures courtesy of National Geographic.