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A hermit crab about to molt eats and drinks heavily, digs constantly, slows down, and grows a gray sac on its abdomen before disappearing underground. The signs build over days or weeks, and most owners miss the early ones. There is also one test that separates a molting crab from a dead one, and it…
Yes, but not one central brain like ours. A hermit crab has a small brain in its head plus a chain of nerve clusters called ganglia running through its body, each controlling the parts nearby. One region of that brain turned out to be far more advanced than anyone expected for a crustacean. Researchers found…
No, hermit crabs are not true crabs. They sit on a separate branch of the family tree that scientists nickname the false crabs, alongside squat lobsters and porcelain crabs. The stranger part is what came out of that branch. Genetic work suggests the king crab on a restaurant menu descends from hermit crab ancestors. What…
Hermit crabs live along warm coastlines and oceans worldwide, but the split is nothing like most people assume. Of the 800 plus species, almost every one lives fully underwater. Only about 15 species live on land, and those are the ones sold as pets. One species broke the pattern entirely and lives somewhere no other…
They are not rivals. A coconut crab is a hermit crab, just an enormous one that stopped carrying a borrowed shell. That single decision, giving up the shell, is what let one of them reach 9 pounds while the other stays the size of a baseball for life. Coconut Crabs Are Hermit Crabs? The coconut…
Most hermit crabs that appear to stop eating are doing one of two things: molting, or feeding at night while you sleep. They are nocturnal and eat tiny amounts, so a full-looking dish means very little. There is a simple overnight test that settles it, and it takes about ten seconds to set up. Is…
Yes, but only the basic kind. Hermit crabs feel stress, fear, pain, and comfort, and they clearly react to how they are treated. What they do not have is love, jealousy, or grief the way people experience them. The evidence for this is stronger than most owners realise. One set of experiments on hermit crabs…
Losing a hermit crab happens to almost everyone who keeps them, and it is very often not your fault. Most deaths trace back to stress the crab arrived with, air that was too dry, or a molt that went wrong. Before you go any further, there is one thing worth checking. A molting crab and…
Hermit crabs breathe air through modified gills, not lungs. Those gills pull oxygen straight from the air, but only while they stay damp. That single requirement is why a hermit crab can suffocate in a room full of air, and why most tank deaths trace back to one number on a gauge. Do Hermit Crabs…
Yes, hermit crabs have blood, but it looks nothing like ours. Theirs is a pale blue fluid called hemolymph, and it carries oxygen using copper where our blood uses iron. The strange part is that it is not always blue. The color comes and goes inside the body, and there is one moment when an…
If your hermit crab has buried itself, stopped moving, and you are starting to worry – relax. It is almost certainly molting, a completely normal process where the crab sheds its old outer skin and grows a new, larger one underneath. It looks alarming the first time, but it is actually a sign your crab…
Hermit crabs need shells because they are born with a soft, curved, unprotected abdomen – they lack the hard exoskeleton that covers true crabs. To survive, they move into abandoned snail shells and carry them as mobile homes. The shell protects them from predators, stops them from drying out by keeping their gills moist, and…