Eurasian BitternBotaurus stellarisWhere and when to see them

The Eurasian Bittern is a reedbed heron whose elaborate brown pattern makes an exceptionally effective disguise. It can be present without offering a clear view. The Seine association is Grande Noë at Val-de-Reuil, a floodplain lake excursion inside the Léry-Poses loop rather than an expectation from a main-channel ship. Species background source: https://www.wildlifetrusts.org/wildlife-explorer/birds/herons-egrets-spoonbill-and-crane/bittern

Size

70–80 cm (28–31 in) body length; wingspan about 1.3 m (4.3 ft).

Weight

1–1.5 kg (2.2–3.3 lb).

Lifespan

Maximum 11 years reported by The Wildlife Trusts; not a verified average.

Status

LPO Normandie reports Vulnerable on the French breeding-bird Red List. The Wildlife Trusts reports UK Amber; global assessment not verified.

The Wildlife Trusts describes long motionless periods that help the bird avoid detection. Male breeding calls are deep booming sounds, but that behaviour must not be promised to winter visitors. A winter bird hidden among reeds may reveal itself only through movement or a short flight across a gap.

• It is a heron.
• Its patterned plumage conceals it among reeds.
• It can stand motionless for long periods.
• Males produce deep booming calls.
• Fish including eels are recorded prey.
• Grande Noë is a lake excursion, not deck evidence.
• A reported maximum age is not average lifespan.

The registry recommends winter, and regional LPO evidence confirms that Normandy receives additional wintering birds. However, a verified recurring numerical calendar for Grande Noë itself was not located. Regional occurrence and breeding dates elsewhere cannot supply the missing local month range. The month array is therefore empty.

Large reedbeds supply concealment and feeding habitat. At Grande Noë, attention belongs on vegetated lake margins seen from public observatories, not exposed shipping banks. LPO's account discusses Normandy more broadly; breeding information from the Seine estuary cannot be transferred to this inland reserve.

The Wildlife Trusts explicitly lists eels and other fish as prey. This supports a fish-eating description without establishing that all food is fish or that eels dominate at Grande Noë. A local dietary study, prey proportions and winter feeding timetable were not verified.

Common name

Eurasian Bittern

Scientific name

Botaurus stellaris

Animal group

Birds

Size

70–80 cm (28–31 in) body length; wingspan about 1.3 m (4.3 ft).

Weight

1–1.5 kg (2.2–3.3 lb).

Lifespan

Maximum 11 years reported by The Wildlife Trusts; not a verified average.

Status

LPO Normandie reports Vulnerable on the French breeding-bird Red List. The Wildlife Trusts reports UK Amber; global assessment not verified.

Identification

Look for pale brown plumage heavily streaked and mottled with beige and black. Its bulky heron shape may become clearer during flight than during a concealed standing view. A tan patch in reeds is not sufficient: look for the head, bill and coherent body outline before confirming identification.