Species Profile
Grasshopper Warbler
Locustella naevia
Grasshopper Warbler
Quick Facts
Conservation
LCLeast ConcernLifespan
2–3 years
Length
12–13 cm
Weight
11–15 g
Wingspan
15–18 cm
Migration
Long-distance Migrant
Also known as: Grasshopper Bird, Reeler, Common Grasshopper Warbler
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Appearance
The Grasshopper Warbler is a small, secretive bird with streaked brown upperparts and buff underparts. Its tail is long and rounded, often held fanned. The bird has a distinctive pale supercilium (eyebrow stripe) and a fine, pointed bill.
As is usually the case for warblers, there is no difference in appearance between males and females. Juveniles appear slightly more yellowish. During the breeding season, adults may show a slightly more olive tinge to their plumage.
Identification & Characteristics
Colors
- Primary
- Brown
- Secondary
- White
- Beak
- Brown
- Legs
- Pink
Attributes
Understanding Attributes
Rated 0–100 based on research and observation. A score of 50 is average across all bird species. These attributes are relative and don't necessarily indicate superiority.
Habitat & Distribution
Grasshopper Warblers inhabit areas of dense, low vegetation across Europe and western Asia. They prefer damp areas like marshes, reedbeds, and overgrown fields with scattered bushes.
They are summer visitors in the UK, arriving in April and departing by October. They winter in sub-Saharan Africa, with some passing through southern Europe and North Africa during migration.
With a lot of patience, you may get lucky waiting it out in scrubland or marshland environments throughout England, Wales and southern Scotland by listening out for the distinctive grasshopper-like call.
Distribution
Where to See This Bird
Explore regional guides for locations where this bird has been recorded.
Diet
Grasshopper Warblers primarily feed on insects and other small invertebrates. They forage on the ground, low in vegetation, picking prey from leaves and stems.
Their diet includes grasshoppers, beetles, flies, moths, dragonflies, and small spiders, supplemented with some berries in late summer.
Behaviour
Grasshopper Warblers are known for their skulking behaviour, often creeping through dense vegetation like a mouse. They are more often heard than seen, typically singing from concealed perches. During courtship, males perform short, fluttering display flights above their territories.
Calls & Sounds
The Grasshopper Warbler's song is its most distinctive feature - a continuous, high-pitched trill that sounds remarkably like a grasshopper or cricket. This monotonous 'reeling' can last for several minutes without pause, often delivered from a hidden perch in vegetation.
Nesting & Breeding
Breeding occurs from May to July. Males establish territories and attract females with their distinctive songs. Pairs are monogamous during the breeding season.
The nest is a well-concealed cup made of grass and leaves, typically placed low in dense vegetation or at the base of a bush. Females lay 4-6 eggs, which are white with fine reddish-brown speckles.
Incubation lasts about 12-14 days, primarily by the female. Both parents feed the chicks, which fledge after 10-12 days but remain dependent on adults for another two weeks.
Conservation
While listed as Least Concern globally, Grasshopper Warbler populations have declined in parts of Europe due to habitat loss. Conservation efforts focus on maintaining suitable breeding habitats, including wet grasslands and young forestry plantations.
Birdwatching Tips
- Listen for the bird's distinctive, insect-like song, especially at dawn or dusk. They are frequently heard singing at night, particularly early in the breeding season.
- Search in areas of dense, low vegetation such as reed beds or scrubby grasslands
- Look for movement low in the vegetation rather than trying to spot the bird directly
- Be patient, as these birds are notoriously difficult to see
Did You Know?
- The Grasshopper Warbler can sing continuously for up to 20 minutes without taking a breath.
- Its scientific name 'naevia' means 'spotted', referring to its streaked plumage.
- Despite its name, it's not closely related to other warblers but belongs to its own family, Locustellidae.
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