Kōrero: Crabs, rock lobsters and other crustaceans

The difference between male and female crabs is clear when they are turned upside down, as pictured. A female crab (top photograph) has a broad round tail, which fills most of her under surface, whereas a male (bottom photograph) has a narrow triangular tail. The male triangle crab (Eurynolambrus australis) has larger nippers than the female.