Here’s the honest answer: there isn’t one. Hermit crabs don’t have a widely documented, official collective noun of their own. Some sources loosely borrow “colony” or “cast” from regular crabs, but nothing has ever stuck specifically for hermit crabs, despite them being some of the most quietly dramatic roommates in the ocean.
So instead of forcing a borrowed word to fit, we’re being upfront about it and having a little fun instead.
So What Do We Call a Group of Hermit Crabs?
Officially? Nothing yet. Hermit crabs are technically crustaceans, not true crabs, and they’ve never been formally assigned their own “term of venery” the way real crabs (a cast), lobsters (a risk), or barnacles (a colony) have. The position is wide open, and frankly, hermit crabs deserve something better than a hand-me-down word, fitting, given the whole shell situation.
A Few Made-Up Options, Just for Fun
These are entirely invented by us, not documented anywhere else. Take them as playful suggestions, not fact:
- A Squat of Hermit Crabs — because that’s technically what they’re doing in every shell they didn’t build.
- A Sublet of Hermit Crabs — for the same reason, with slightly more legal accuracy.
- An Eviction of Hermit Crabs — for when a bigger crab wants a smaller one’s shell, which happens more than you’d think.
- A Landlord’s Nightmare of Hermit Crabs — self-explanatory.
Hermit Crab Facts (These Ones Are Real)
- Habitat: Hermit crabs live in coastal marine environments worldwide, with some species also adapted to spend much of their life on land.
- The shell situation: Hermit crabs don’t grow their own shells. They occupy empty shells left behind by sea snails and other mollusks, and must find a new, larger one every time they outgrow their current home.
- Social behavior: Hermit crabs are genuinely social and will sometimes form “vacancy chains,” lining up by size and swapping shells in sequence when a new, larger shell becomes available.
- Diet: Omnivorous scavengers, eating algae, plankton, and organic debris.
- Lifespan: Some species can live surprisingly long lives in captivity, with well-cared-for pet hermit crabs occasionally reaching 20–30 years.
Frequently Asked Questions
What is the official collective noun for a group of hermit crabs?
There isn’t one. Hermit crabs don’t have a widely documented collective noun of their own, though some sources loosely borrow terms like colony or cast from true crabs.
Are hermit crabs actually crabs?
Not technically. Hermit crabs are crustaceans, but they belong to a different group than true crabs, one key difference being their soft, asymmetrical abdomen, which is why they need to borrow a shell for protection.
What is a vacancy chain?
It’s a real, documented hermit crab behavior where multiple crabs line up by size near a new, larger shell and swap shells in sequence as each one moves up, sometimes within seconds of each other.
Can I make up my own collective noun for hermit crabs?
Absolutely. There’s no official answer to compete with, so this is genuinely open territory. Leave your suggestion in the comments.
Got a Better One?
We want to hear it. Drop your own collective noun for a group of hermit crabs in the comments, bonus points if it’s a real-estate pun. If one catches on, it might just become the unofficial official answer around here.
Related: Collective Nouns for Crustaceans · What Is a Group of Crabs Called?