Hermit crabs are small crabs that carry shells on their backs, both for a home and for safety. But with shells being harder to find year after year, hermit crabs have had to spend more time in shells ...

Paracalliactis tsukisome, pale pink and soft-bodied, builds rigid, shell-like structures that hermit crabs use for protection—turning a passive invertebrate into an underwater architect. Uncovered ...