Konrad Wothe / Halloween Crab (Gecarcinus quadratus) in defensive posture on beach, Manuel Antonio National Park, Costa Rica

Edwin Giesbers / Red / Halloween land crab (Gecarcinus quadratus), Costa Rica

Edwin Giesbers / Red / Halloween land crab (Gecarcinus Quadratus), Costa Rica

Jouan & Rius / Red / Halloween land crab (Gecarcinus quadratus) in mangrove, pacific coast, Costa Rica

Philippe Clement / Halloween crab / Harlequin / Red land crab {Gecarcinus quadratus} next to burrow in forest, Manuel Antonio NP, Costa Rica.

Cyril Ruoso / Halloween Crab (Gecarcinus quadratus) in rainforest, Osa Peninsula, Costa Rica

Gary Bell/ Oceanwide / Halloween Hermit Crab (Ciliopagurus strigatus), Bali, Indonesia

Cyril Ruoso / Mexican land crab (Gecarcinus quadratus) in rainforest. Osa Peninsula, Costa Rica.