Hermit Crab vs Coconut Crab: Are They the Same?

Here is the twist: a coconut crab is actually a type of hermit crab – a giant one. The big difference is that a coconut crab grows so large it stops carrying a borrowed shell, while your pet hermit crab keeps its shell for life. Coconut crabs can weigh up to 9 pounds with a leg span of 3 feet, making them the largest land animal with an exoskeleton on Earth. Here is how these two crabby cousins really compare.

Wait – Is a Coconut Crab a Hermit Crab?

Yes, it is. The coconut crab (scientific name Birgus latro) belongs to the same land hermit crab family as your pet crab.

As babies, coconut crabs carry borrowed snail shells just like normal hermit crabs. But as they grow, their belly hardens into a tough armor, and they ditch the shell for good. So a coconut crab is basically a hermit crab that got huge and gave up its shell.

Hermit Crab vs Coconut Crab: Side by Side:

Here is how the two compare at a glance:

Feature	Pet Hermit Crab	Coconut Crab
Size	Up to a baseball	Up to 3 feet across
Weight	A few ounces	Up to 9 pounds
Shell	Borrowed for life	Only as a baby
Lifespan	15 to 25 years	Up to 60 years
Can be a pet?	Yes	No (wild, protected)

Size: The Biggest Difference:

This is where they really split. A pet hermit crab grows to about the size of a baseball at most, weighing a few ounces.

A coconut crab is a giant. It can span 3 feet from leg to leg and weigh up to 9 pounds – no land animal with an exoskeleton grows bigger anywhere in the world.

The Shell: Kept vs Ditched:

Your pet hermit crab needs a borrowed snail shell its whole life to protect its soft belly and stay moist. Without one, it cannot survive.

A coconut crab only borrows shells as a baby. As it grows, its abdomen hardens with chitin and calcium into natural armor, so the adult never carries a shell. That freedom from a shell is exactly what lets it grow so big.

Strength and the “Robber Crab” Name:

Coconut crabs are famously strong. Their claws can grip with a force of around 740 pounds, strong enough to crack open a coconut – and they can lift objects up to 60 pounds.

They are also nicknamed “robber crabs” because they snatch and drag away shiny objects like spoons, pots, and even shoes. Your pet hermit crab, by contrast, has a gentle pinch and no such mischief.

Where Each One Lives:

Pet hermit crabs (like the Caribbean species) come from warm Atlantic and Caribbean coastlines and are common in the pet trade.

Coconut crabs live on remote tropical islands across the Indian and Pacific Oceans. They are listed as vulnerable, so they are protected in many areas and are not kept as pets.

Conclusion:

So, hermit crab vs coconut crab? They are cousins, not opposites. The coconut crab is simply a giant land hermit crab that outgrew its shell and armored up instead.

Your pet hermit crab stays small, keeps its borrowed shell, and lives happily in a tank. The coconut crab grows into a 9-pound island giant. Same family, wildly different lives.

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