Here's why:
* Shells are essential for survival: Hermit crabs rely on empty shells for protection from predators and the elements. They need shells that fit well and offer the best defense.
* Competition is indirect: While there can be competition for shells, it's more of an indirect process. Hermit crabs might find a shell that another crab is using and try to pry it off, but this is rare.
* Peaceful coexistence: Hermit crabs are generally peaceful creatures and prefer to avoid conflict. They are more likely to look for an empty shell than to fight over a shell that's already occupied.
Here's what *is* true about hermit crab shells:
* Shell-swapping: Hermit crabs will switch shells if they find a better one. This is a natural process of finding the best fit for their needs.
* Shell size: As hermit crabs grow, they need to find bigger shells. They might be seen exploring empty shells and trying them on to find a suitable replacement.
* Shell availability: The availability of empty shells can influence the size and quality of shells available to hermit crabs.
So, while "hermit crab shell fighting" might make for a good story, it's not an actual behavior they engage in. They are more likely to search for new shells peacefully rather than fighting over them.