Artificial homes for hermit crabs
"Right now, 30 percent of all hermit crabs on our shorelines are living in shells that are too small for them. In the springtime, when the animal has its growth spurt, this shortage skyrockets to 60 percent. Hermit crabs, whose own bodies provide only thin exoskeletons, must scavenge and appropriate hard-walled shells abandoned by marine gastropods for shelter. The problem is that there currently are not enough shells left on our beaches for hermit crabs to use. This situation is not only uncomfortable but dire."
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