Sedge Warbler

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Sedge Warbler in the UK

Sedge Warbler is a common summer visitor, with about 240,000 breeding territories in the UK. Birds arrive from mid April and leave by late September to winter in Africa south of the Sahara. Numbers rise and fall from year to year, and the long-term trend is down: the breeding index fell 33% between 1967 and 2024. It is widespread in lowland wetlands, with high densities in eastern England, the Scottish Central Belt and eastern Scotland. Amber-listed.

Where and when to see a Sedge Warbler

Reedbed edges, ditches, riverside scrub, damp nettle beds and bramble next to water, from mid April to August. Late April to early June is best, when males sing all day from exposed perches and in short song flights. Most wetland reserves have them: RSPB Fowlmere in Cambridgeshire, Middleton Lakes in Staffordshire and Surlingham Church Marsh in Norfolk are suggested. After June birds go quiet and skulk. In August, reedbeds on the south coast fill with birds fattening up to migrate.

Habitat, diet and field notes

Habitat: Reedbeds, ditches (summer).
Diet: Insects.
Field note: Streaky; chattering improvised song.

How to identify a Sedge Warbler

A small, streaky brown warbler, a little smaller than a Robin. The broad cream stripe over the eye is the first thing to look for, set off by a dark, streaked crown and a dark line through the eye. The back is streaked, the rump is plain tawny and the underparts are cream. Juveniles have fine spots across the breast. It climbs up stems to sing, then drops back into cover, and often sings in a short rising flight.

Call and song

A fast, loud, restless song that mixes harsh chattering with sweet whistles and bits copied from other birds. It keeps changing tempo and never settles into a pattern. Reed Warbler, by contrast, chugs along at an even pace. The call is a dry "tuc" or a rasping "churr". Heard something you cannot place? Bird Hear identifies UK birds from a 10 second recording, free in your browser.

Confusion species

• Common Reed Warbler: Reed Warbler is plain unstreaked brown with only a faint eye stripe and a slower, steadier song.
• Aquatic Warbler: Aquatic Warbler, a rare autumn migrant, is yellower with a pale stripe down the centre of the crown and bold pale lines on the back.
• Common Grasshopper Warbler: Grasshopper Warbler is streaked but has no strong eye stripe and sings a long mechanical reel.

Month by month

A summer visitor, typically in the UK from April to September. Numbers peak in May. See the May birding guide for what else is about. More on the season in Bird migration in Britain.

Taller bars mean more birds about. Grey means it is usually absent.

Conservation status and Birdedex points

In the Birdedex the Sedge Warbler is a Common tier bird, worth +1 point when you log one. It is Amber-listed in Birds of Conservation Concern 5, the middle level of concern in the UK.

Recent UK sightings

Similar birds

• Common Reed WarblerUncommon · Reedbeds (summer)
• Great Reed WarblerEpic · Reedbeds (very rare)
• Marsh WarblerRare · Damp scrub (very rare summer)
• Aquatic WarblerEpic · Sedge marsh (rare passage)
• Blyth's Reed WarblerRare · Coastal scrub (very rare)
• Paddyfield WarblerEpic · Reed scrub (very rare)

Sedge Warbler: quick answers

When is the best time to see Sedge Warbler?

Late April and May. Males sing most before they find a mate, so a bird singing hard in June is usually unpaired. Go early on a calm morning, when they sit up on reed tops and bramble sprays.

What does a Sedge Warbler eat?

Insects and spiders picked from stems and leaves. Before migrating it gorges on plum-reed aphids in reedbeds and can nearly double its weight. That fuel lets some birds reach West Africa in very few stops.

What is the difference between Sedge Warbler and Reed Warbler?

Sedge Warbler has a bold pale eye stripe, a streaked back and crown, and a frantic, varied song. Reed Warbler is plain brown with a weak face pattern and a repetitive, rhythmic song. Sedge is also happier away from pure reed, in ditches and scrub.

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