Ingo Arndt / Christmas Island red crab (Gecarcoidea natalis) migrating, Christmas Island, Indian Ocean, Australian Territory, November

Ingo Arndt / Two Christmas Island Red Crabs (Gecarcoidea natalis) locked in combat, on rocks, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Christmas Island Red Crab (Gecarcoidea natalis) feeding on the remains of another crab crushed on the road, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Wildlife Photographer Ingo Arndt taking pictures of Christmas Island Red Crabs (Gecarcoidea natalis) in coastal cavern, Christmas Island, Indian Ocean, Australian Territory, November 2009.

Ingo Arndt / Christmas Island Red Crab (Gecarcoidea natalis)female spawning in shallow water near beach, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Christmas Island Red Crabs (Gecarcoidea natalis) mass arrived on coast for spawning / Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Christmas Island Red Crab (Gecarcoidea natalis) / crushed by car while crossing the road during annual migration, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Christmas Island Red Crab (Gecarcoidea natalis) / sitting on road during annual migration, eating fruit, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Christmas Island Red Crab (Gecarcoidea natalis) dirty after walking through a phosphate mining area crossing road during annual migration, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Christmas Island Red Crabs (Gecarcoidea natalis) crossing road in huge numbers during annual migration, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Christmas Island Red Crab (Gecarcoidea natalis) close-up of claw, Christmas Island, Indian Ocean, Australian Territory.

Ingo Arndt / Christmas Island Red Crab (Gecarcoidea natalis) eggs in females opened brood pouch shortly before spawning / Christmas Island, Indian Ocean, Australian Territory