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Dartford warbler

©Richard Steel/2020VISION

Dartford warbler

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Scientific name: Sylvia undata
The small, brown Dartford warbler is most easily spotted when warbling its scratchy song from the top of a gorse stem. It lives on lowland heathland in the south of England, where it nests on the ground.

Top facts

Stats

Length: 12cm
Wingspan: 16cm
Weight: 10g
Average lifespan: Up to 5 years

Conservation status

Classified in the UK as Amber under the Birds of Conservation Concern 45: the Red List for Birds (2021). Protected in the UK under the Wildlife and Countryside Act, 1981. listed as Near Threatened on the global IUCN Red List of Threatened Species.

When to see

January to December

About

The Dartford warbler is dependent on mature, dry heath habitats in the UK, and particularly on gorse that is in good condition for surviving cold, harsh winters. It only eats insects and does not migrate for the winter, which means it is vulnerable to cold weather and prolonged snow cover. It is a ground-nesting bird, preferring to breed under the protective cover of dense heather or compact gorse. It makes a grassy, cup-shaped nest, in which it lays three to five eggs. It can have up to three broods from April to July.

What to look for

The Dartford warbler is a small, dark brown bird, with a long tail, a distinctive red eye-ring and a cherry-red breast. It is most often spotted warbling its rattly and scratchy song from the top of a gorse stem. At other times, its muted tones allows it to blend in with the woody heather and gorse.

Where to find

A resident of lowland heaths south of the Thames and spreading west to Dorset. Also found at the coast in Suffolk, and on Exmoor and the Quantocks.

Did you know?

When the UK's breeding population of Dartford warblers crashed in the 1960s, only 10 pairs remained. Today, there are about 3,200 pairs nesting on our lowland heaths.