Eurasian Bittern
Botaurus stellaris
Overview
Covered in streaked brown plumage, the Eurasian bittern has a stocky body, a thick neck, and a strong, pointed bill, giving it a bulky appearance compared to other herons.
Adults typically measure 69cm to 81cm tall, with a wingspan of 100cm to 130cm and weigh between 0.87kg and 1.9kg. Males may be slightly larger than females.
- Found in
- Europe, Asia, Africa
- Class
- Aves
- Order
- Pelecaniformes
- Family
- Ardeidae
- Genus
- Botaurus
Conservation Status
While today a species of Least Concern, the Eurasian bittern does face fragmentation and degradation of their reedbed and wetland habitat. They rely on dense, tall stands of reeds over shallow water for feeding, breeding and shelter. However, many wetlands have been drained for urban or agricultural expansion, and reedbeds have been fragmented or allowed to become unsuitable through neglect. Additionally, environmental pollution, human disturbance of nesting sites, and the effects of climate change further affect bittern populations.
Major conservation efforts focused on environmental restoration are delivering promising results in parts of their range. For example, in the UK, large-scale reedbed creation and restoration is helping to reverse a dramatic decline in wetland ecosystems and thus available bittern habitat. In mainland Europe, bitterns also benefit from programmes focused on habitat restoration, water-level management, and public awareness campaigns about protection of these sensitive ecosystems.
These protective efforts have helped near-extinct bittern populations to recover, and, if maintained, will help keep this species stable in the wild.
- Wild Population
- 184,000 - 310,000
- Conservation Status
- Least concern
Animal Facts
- Eurasian bitterns mainly eat fish, amphibians, insects, and small mammals, catching them with quick thrusts of their dagger-like bill.
- The male Eurasian bittern’s deep, foghorn-like boom call can be heard from up to 5km away.
- The male Eurasian bittern’s distinctive call is produced by inflating its oesophagus to act like a resonating chamber. It is one of the most distinctive bird sounds in Europe.
- The Eurasian bittern’s streaked brown and buff plumage blends perfectly with reed stems, making it almost invisible when standing motionless with its bill pointing upward.
- The Eurasian bittern was almost completely extinct in the UK in the late 19th century, but habitat restoration projects have led to a strong recovery.
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Social & Reproduction
Eurasian bitterns are solitary birds, although will tolerate other individuals outside of the mating season. Unlike many bird species, they do not form lasting pairs during the breeding season and part ways soon after mating.
The breeding season for Eurasian bitterns is from late winter to early spring. During this time, the male establishes a territory within a large reed bed and defends it with his characteristic ‘boom’ call, both to attract females and warn off rival males. He may mate with up to 5 females entering his territory in one season.
Following mating, the female builds a nest out of last year’s standing reeds, sedges and stems, creating a shallow floating platform at the water’s edge. Here, she lays a clutch of 3 to 6 eggs. Females are the sole carer for offspring, and after egg-laying, incubation lasts approximately 25 to 28 days. Chicks usually hatch several days apart and then remain in the nest for 2 weeks. After this, they leave the nest and disperse into the surrounding reedbed environment but are still provisioned for by their mother. The chicks fledge fully and gain flight capability at around 6 to 8 weeks of age.
Following fledging, the young gradually become independent, though throughout this time the female continues to provide food (often regurgitated prey) until the juveniles can feed themselves entirely. Eurasian bitterns reach sexual maturity at 1 year old.