Coconut Crab: The World's Largest Land-Dwelling Arthropod and Its Unique Adaptations
The coconut crab, also known as the robber crab, is the largest land-dwelling crustacean and arthropod, with a leg span of up to one meter and a body weight exceeding four kilograms. Found on tropical islands across the Indian and Pacific Oceans, these crabs are known for their ability to climb trees, crack coconuts, and deliver powerful pinches. They inhabit coastal forests, often hiding among rocks and burrowing under tree roots. The coconut crab breathes air using branchiostegal lungs, which are an evolutionary bridge between gills and lungs, and can drown if submerged for too long. They return to the sea only when females release eggs into the water. The species can live up to 60 years, with large adults being the result of decades of growth and moulting. 
