A group of lobsters is called a risk.
It’s an unusual word to find attached to an animal, and that’s part of what makes it memorable. Lobsters aren’t naturally social, in fact, they’re famously the opposite, so “risk” isn’t describing some cooperative pod moving through the water together. It’s simply the term that’s stuck as the standard collective noun for the species.
What Is a Group of Lobsters Called?
The only well-documented collective noun for lobsters is a risk of lobsters. Unlike crabs or shrimp, lobsters don’t have a widely used alternate term, so “risk” is the one to know.
Where Did the Name Come From?
The honest answer is that “risk” doesn’t have a clear, verifiable origin story. You’ll find claims online tying it to Old French or to the danger of hauling up a trap full of lobsters, but none of these hold up to real scrutiny, and there’s no solid documentation connecting the word to any old hunting or fishing tradition. Lobsters, like most crustaceans, weren’t quarry in the medieval “terms of venery” tradition cataloged in the Book of Saint Albans (1486), so it almost certainly isn’t part of that lineage either.
What’s more plausible is that “risk” is a later, invented addition to the collective-noun tradition, the kind of word that gets adopted simply because it’s memorable and a little odd, rather than because it describes anything specific about lobster biology or behavior. If there’s a connecting thread at all, it may be the loose association between lobsters and the literal risk involved in handling them: their large claws can do real damage, and lobsters kept together in tanks are known to fight, sometimes seriously injuring each other, which is why lobster tanks often band their claws.
Either way, it’s a good example of a collective noun chosen for flavor rather than documented history, and this site would rather say so plainly than invent a tidier origin story.
Lobster Facts
- Habitat: Lobsters live on the floor of cold and temperate ocean waters, usually hiding in rocky crevices, burrows, or sandy hollows at depths from a few feet down to several hundred feet.
- Social behavior: Lobsters are solitary and territorial, not social. They live alone, defend their burrows aggressively against other lobsters, and only tolerate close contact during mating season, so “risk” is a borrowed, whimsical word rather than a biologically descriptive one.
- Diet: Lobsters are carnivorous, opportunistic hunters and scavengers, eating fish, clams, mussels, worms, and other crustaceans, using their powerful claws to crush shells.
- Lifespan: Lobsters grow and molt throughout their entire lives and can live remarkably long: American lobsters are estimated to commonly reach 10-40+ years in the wild, and the largest, oldest individuals are believed to live past 100 years.
- Indeterminate growth: Because lobsters keep molting and growing for as long as they live, and shed the evidence of their age every time they do, scientists can’t pinpoint an exact age for a wild lobster the way they can with many other animals.
Example Sentences
- The trap came up holding a full risk of lobsters.
- A risk of lobsters crowded the bottom of the tank at the market.
Other Names for a Group of Lobsters
Explore the collective noun for lobsters in more depth:
Frequently Asked Questions
What is a group of lobsters called?
A group of lobsters is called a risk. It’s the only well-documented collective noun for lobsters.
Why are lobsters called a “risk”?
The exact origin isn’t well documented. It doesn’t appear to trace back to old hunting terminology, and is more likely a later, invented addition to the collective-noun tradition.
Do lobsters actually gather in groups?
No, lobsters are solitary and territorial by nature. They live alone in burrows and defend their territory aggressively, only tolerating close contact during mating season.
How long do lobsters live?
Lobsters commonly live 10-40 years or more in the wild, and the oldest, largest individuals are believed to live past 100 years, since they keep growing and molting throughout their lives.
Why is it hard to know a lobster’s exact age?
Lobsters shed their hard shell every time they molt, which removes any physical record of their age, making precise aging very difficult.
Related: Collective Nouns for Crustaceans