Birds
Thrush
Turdidae · also called thrushes
A thrush is the plump, ground-feeding songbird behind some of the most familiar birds in the world, the American robin bouncing across a lawn, the European blackbird singing from a rooftop, the bluebird dropping onto an insect from a fence post. One relative, the song thrush, has even worked out how to use a tool, smashing snails against a favourite stone.
Overview
Thrushes are the family Turdidae, roughly 170 species worldwide, sharing a plump body, a fairly long tail, and a habit of feeding on open ground. They eat earthworms, snails, and insects in summer, switching heavily to berries in winter, and many are outstanding, if unrelated, singers — the nightingale, despite the comparison, is actually a separate family.
The anvil-user
The song thrush carries snails to a favourite flat stone and smashes the shell against it with repeated blows — genuine tool-assisted feeding, marked by a telltale scatter of broken shells. Most thrush chicks hatch with a spotted breast, an old camouflage pattern some species, like the wood thrush, keep for life while others, like the blackbird, lose it entirely as adults.
Watching for worms
A thrush cocking its head on a lawn is not listening for a worm underground — it is looking, using one eye to spot the tiny surface disturbance of a moving worm before stabbing down to seize it.
Status
Least Concern — most thrushes, including the robin, blackbird, and song thrush, thrive around people. Forest-interior specialists like the wood thrush are declining as both breeding and wintering forests are cleared and fragmented.
Thrush: common questions
Is a robin a thrush?
Yes, both the American robin and the European robin are true thrushes, members of the family Turdidae, even though the two are not each other's closest relatives and were given the same name independently by homesick European settlers who thought the American bird's red breast resembled the familiar robin back home. The American robin is, in fact, one of the most typical and widespread thrushes on its continent, sharing the family's build, feeding style, and spotted juvenile plumage, while the European robin, despite the name, sits slightly apart within the thrush family's broader relatives.
Is the nightingale a thrush?
No, despite the similar rich, celebrated song. The nightingale belongs to the Old World flycatcher family, Muscicapidae, which is closely related to thrushes but distinct from them, sharing a common ancestor rather than being a direct member of Turdidae. The confusion is understandable, since nightingales and thrushes are similar in size, shape, diet, and habitat and were once classified together, but modern genetic studies place the nightingale just outside the thrush family proper.
Why do thrush chicks have spotted breasts?
The spotted or scaled pattern is an old, ancestral thrush feature, most likely useful for camouflaging vulnerable nestlings and fledglings among dappled light and leaf litter on the forest floor. Many species keep the pattern into adulthood, including the song thrush and the American wood thrush, because it continues to help adults blend in while feeding on the ground. Others, most famously the male common blackbird, lose the spots as they mature and develop the plain, glossy black adult plumage, even though blackbird chicks hatch with the same spotted juvenile pattern as their spotted relatives.
How does a song thrush use an anvil to eat snails?
The bird picks up a snail in its bill, carries it to a chosen hard surface, usually a flat stone, and swings its head to smash the shell against the anvil with repeated sharp blows until it cracks open, then extracts and eats the soft body. Individual thrushes tend to return to the same favourite anvil stone again and again, and a heavily used one becomes surrounded by a scatter of broken shell fragments that is often the first sign birdwatchers notice of a thrush's presence, well before they see the bird itself.