Christian Ziegler / Short-tailed Crab (Potamocarcinus sp) in defensive posture, Barro Colorado Island, Panama

James Christensen / Short-tailed Crab (Pseudothelphusidae) in defensive posture on forest floor, Mindo, western slope of Andes, Ecuador

Piotr Naskrecki / Short-tailed Crab (Fredius sp) can often be found outside of water, foraging on the forest floor, Guyana