The Coconut Crab: The World's Largest Land Arthropod
The coconut crab (Birgus latro) can grow up to three feet across and weigh over nine pounds, making it the largest terrestrial invertebrate on Earth. These massive crustaceans possess claws powerful enough to crack open coconuts and lift objects weighing up to 60 pounds—roughly six times their body weight. Perhaps most remarkably, adult coconut crabs have evolved to breathe air through specialized organs called branchiostegal lungs, and they will actually drown if submerged in water for too long, despite being crustaceans. Found on tropical islands across the Indian and Pacific Oceans, these nocturnal giants can live for over 60 years and are considered vulnerable due to habitat loss and overharvesting.