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What Is a Group of Thrushes Called?

The recorded term is a mutation of thrushes. It’s one of the more unusual-sounding collective nouns in English, and despite the modern genetic connotation of the word, it has nothing to do with biology — it’s simply an older usage of “mutation” meaning a change or shifting, possibly a nod to how a feeding or migrating group of thrushes seems to constantly shift and reposition.

Where Did the Name Come From?

“Mutation” traces to the same 15th-century tradition of English hunting and venery terms compiled in the Book of Saint Albans (1486), where many birds were given fanciful, sometimes puzzling collective nouns. The exact reasoning isn’t documented, but the older sense of “mutation” as simply “a change” fits a restless, shifting flock better than the word’s modern scientific meaning would suggest.

Thrush Facts

• Family: Turdidae, a large songbird family that also technically includes robins and bluebirds, though those are usually discussed separately due to their distinct common names.
• Song: Thrushes are renowned singers; the song thrush in particular is known for repeating musical phrases two or three times in a row, a distinctive pattern among European birdsong.
• Diet: Omnivorous, eating earthworms, insects, snails, and berries; some species famously use a favorite stone as an “anvil” to smash open snail shells.
• Migration: Many thrush species are migratory, and while they don’t typically form the huge, tight flocks seen in starlings, migrating birds can concentrate loosely where food is abundant.
• Range: Thrushes are found nearly worldwide, from woodland and hedgerow species in Europe to forest-dwelling species across North and South America.
• Decline: Some thrush species, including the song thrush, have seen significant population declines in parts of their range due to habitat loss and changing farming practices.

Example Sentences

• A mutation of thrushes worked the hedgerow at dawn, flipping leaves in search of worms and snails.
• Birders noted an unusually large mutation of thrushes feeding on a berry-laden hawthorn.
• The garden’s resident thrush sang from the same perch each morning, though a full mutation rarely gathered there at once.

Frequently Asked Questions

What is a group of thrushes called?

A group of thrushes is called a mutation.

Do thrushes typically gather in large flocks?

Not usually in the tight, large flocks seen in starlings, but thrushes can loosely concentrate together during migration or where food is abundant.

Why is it called a mutation of thrushes?

The term likely uses an older sense of “mutation” meaning a change or shift, possibly referencing how a feeding group constantly repositions, rather than any modern genetic meaning.

How do thrushes crack open snail shells?

Some species use a favorite stone as an “anvil,” smashing the snail against it repeatedly until the shell breaks.

Are robins a type of thrush?

Yes, technically. Robins and bluebirds both belong to the thrush family Turdidae, though they’re usually discussed under their own common names.