great bittern

The Great Bittern (Botaurus stellaris), also commonly known as the Eurasian bittern, is a master of camouflage and a member of the heron family. This elusive wading bird is renowned for its secretive nature and the haunting, low-frequency booming call of the male during the breeding season.

Standing between 70-80 cm in height, the Great Bittern possesses a robust build with a thick neck and large, greenish-yellow legs. Its plumage is a masterpiece of natural mimicry, featuring cryptic golden-brown feathers streaked and barred with black and dark brown. This allows the bird to disappear completely against a backdrop of dried reeds. In flight, it displays broad, rounded wings and trails its legs in typical heron fashion.

This species is highly specialized, primarily inhabiting freshwater or brackish marshes with extensive reedbeds. While some populations are sedentary, northerly birds migrate to warmer regions in Africa and Southern Asia. Outside of the breeding season, they may adapt to less restrictive habitats, including:

• Rice fields and watercress beds
• Fish farms and gravel pits
• Sewage works and flooded ditches
• Ditches and marshes

The Great Bittern is a versatile predator that hunts stealthily along reed margins. Its diet consists of:

• Fish: Including eels up to 35 cm and various other species.
• Amphibians: Frogs and newts.
• Insects: Over twenty families of beetles, dragonflies, bees, and grasshoppers.
• Small Mammals: Mice and voles.
• Birds: Small birds and fledglings.
• Invertebrates: Crabs, shrimps, molluscs, and spiders.

Males are polygamous, often mating with up to five females. The female takes sole responsibility for nesting and rearing young. She constructs an untidy platform of reeds and grass within the reedbeds. A clutch of four to six olive-brown eggs is laid in late March or April. The chicks leave the nest at approximately two weeks of age to explore the surrounding reeds and become fully fledged at about eight weeks.

The Great Bittern is famously shy and primarily crepuscular, being most active at dawn and dusk. When threatened, it adopts a pose known as "bitterning," where it stretches its neck and bill vertically and sways slightly to mimic wind-blown reeds. It is a solitary forager that moves with a slow, deliberate gait, often clambering over reed stalks by gripping several at once with its large toes.

While the IUCN classifies the Great Bittern as Least Concern globally, many local populations are at risk due to the loss of wetland habitats. In the United Kingdom, it is considered one of the most threatened bird species. The southern subspecies (B. s. capensis) in Africa has also seen a dramatic decline, making its conservation a significant concern.

1. The male's booming call is so powerful it can be heard up to five kilometers away.
2. To clean itself after eating slimy eels, the bittern uses "powder down" produced by specialized feathers on its breast.
3. Bitterns have a unique ability to look forward while their bill is pointed directly upward, thanks to the positioning of their eyes.
4. Juveniles may disperse hundreds of kilometers away from their birth site after the breeding season.

Seeing a Great Bittern requires patience and timing. The best time to locate them is during the spring breeding season when the males are booming. Visit large reedbed reserves at dawn or dusk. During exceptionally cold winters, keep an eye on the edges of frozen water bodies, as the birds may be forced into the open to find food.

The Great Bittern is a fascinating symbol of the health of our wetland ecosystems. Its remarkable adaptation to life in the reeds makes it a "ghost of the marsh" that continues to captivate birdwatchers and conservationists alike. Protecting and restoring reedbeds is vital to ensuring the survival of this unique and secretive bird.