Age is measured by counting the otoliths, or growth rings, at the base of the antennae post-mortem. Size is hard to calculate, as hermit crabs will grow and moult depending on environment, diet, exercise, species and other random factors. However, you can observe the change in the size of Carol of Crab Works’ hermit crabs over thirty-five years in captivity to get an idea of size over time. A Tennis Ball-sized hermit crab is at the very least thirty to fifty years old, based on John and Kate’s growth as a reference.




Size and Aggression, Competition for Shells

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