Birds Active during the day

Great Reed Warbler

Acrocephalus arundinaceus

iNaturalist eBird Wikipedia

The 'King of the Reeds,' the Great Reed Warbler is a powerhouse of the wetlands, known for its commanding size and a song that can shake the marshlands.

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Quick Identification

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Size

Length: 19–20 cm (7.5–8 in); Wingspan: 25–30 cm (10–12 in); Weight: 25–38 g (0.9–1.3 oz)

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Colors

Rich olive-brown upperparts and creamy-white to buff underparts; distinct pale cream eyebrow (supercilium) and dark eye-stripe; bill is brownish with a yellowish base.

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Key Features

Largest European warbler with a heavy, powerful bill
Prominent pale cream eyebrow (supercilium) stretching behind the eye
Distinctive, loud, croaking 'karra-karra-kree-kree' song
Strong, large greyish-brown legs suited for gripping vertical reeds

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 5-10 AM, 5-8 PM

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Season May-August (Breeding season in Europe)

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Diet Primarily insectivorous, targeting large aquatic insects like dragonflies, damselflies, beetles, and moths. They will also take spiders, snails, and occasionally small vertebrates like tadpoles or tiny fish. In late summer, they supplement their diet with berries.

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Habitat Extensive reed beds (Phragmites) located along lakes, slow-moving rivers, canals, and marshes.

Behavior

The Great Reed Warbler is a boisterous and territorial songbird, famous for its remarkably loud, harsh, and rhythmic song that can be heard from a great distance across wetlands. During the breeding season, males are highly conspicuous, often perching atop the tallest reed stems to defend their territory. They are known for their complex social lives, frequently engaging in polygyny where a single male may defend a territory containing multiple nesting females.

These birds are master navigators of vertical environments, using their large feet to hop and climb between reed stalks with agility. They are also famous for their aggressive defense against the Common Cuckoo; as a frequent host of cuckoo eggs, the Great Reed Warbler has evolved the ability to recognize and sometimes reject 'imposter' eggs, leading to an evolutionary arms race between the two species.

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Camera Tips

To capture the Great Reed Warbler, focus your camera on 'singing posts' rather than the ground. Look for the tallest, sturdiest reeds that stand above the rest of the marsh canopy; males will return to these exact spots repeatedly to sing. Secure your camera to a pole or stake roughly 4 to 5 feet above the water level, ensuring the lens is angled slightly upward to catch the bird against the sky or distant foliage.

Since these birds inhabit windy reed beds, use a camera with high-speed trigger settings and a 'Burst' or 'Multi-shot' mode. This helps ensure that at least one frame is sharp even if the reeds are swaying. If your camera supports it, decrease the motion sensor sensitivity slightly to prevent the movement of the reeds themselves from filling your SD card with 'blank' videos, or use a zone-shielding feature to focus only on the top half of the frame.

The most dramatic footage is often captured during the early morning hours (just after sunrise) when the bird's orange gape is visible as it sings. If you are placing a camera in a backyard that borders a wetland, you can encourage visits by maintaining a small area of open water near dense vegetation, though they rarely visit traditional bird feeders. Placing a camera near a known nesting site (from a respectful distance) during June can provide incredible footage of adults bringing large dragonflies to their young.

Similar Species

Species that look similar or are commonly confused with Great Reed Warbler.

Eurasian Reed Warbler

Much smaller in size with a more melodic, less 'grating' song and a finer bill.

Marsh Warbler

Almost identical in plumage but smaller, with a highly mimetic song and a preference for drier, bushier vegetation rather than deep reeds.

Clamorous Reed Warbler

Very similar in appearance and song but found further south in Asia and Australasia, with slightly shorter wings.

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Frequently Asked Questions

They are most active during the early morning and late afternoon. Males are particularly vocal at dawn, often singing loudly to re-establish territory boundaries as the sun rises.

Unlike garden birds, they aren't attracted to seeds. The best way to attract them is to maintain or plant a patch of Common Reed (Phragmites) or similar tall aquatic vegetation near a pond or wetland area to provide nesting habitat and food.

They are insectivores that specialize in large wetland insects. Their diet includes dragonflies, beetles, and moths, but they will also eat small snails and occasionally tadpoles or berries in the autumn.

They are only common in suburban areas that have significant water features, such as large retention ponds, canals, or lakes with healthy, undisturbed reed margins.

The Great Reed Warbler is significantly larger (nearly thrush-sized) and has a much louder, harsher song. It also possesses a heavier, more powerful bill and a more distinct pale eyebrow than the smaller Reed Warbler.

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