Cormorant

Cormorant

Key facts

Scientific name: Phalacrocorax carbo
Status: Resident breeding species

Breeding birds: 9,018 pairs

Wintering birds: 41,000

Conservation status: Green

Family: Cormorants

Length: 80 – 100 cm
Wingspan: 130 – 160 cm
Weight: 2.1 – 2.8 kg

Description

Adult cormorants in breeding plumage are glossy black with bronze on the lower back, rump and wings, and blue-black on their upper back and tail. The plumage has a scaled effect. The underparts are black and there is a conspicuous  white patch on the thighs.

The head and chin are black with bare, white skin on the cheeks and throat. There is a loose crest of elongated, white feathers on the nape, which may extend to the rear neck or fore neck. The thick, straight bill is horn-coloured with a yellow or orange gape, and hooked tip, the eyes are emerald-green, and the short legs and webbed feet are black.

Out of breeding plumage, cormorants have duller plumage and lose most of the white feathers.  Males and females look similar, but the male is slightly larger with a larger bill.

Juvenile cormorants are mottled with a brown neck and white belly. By the second year they resemble adults but are browner.

Breeding

Cormorants breed all year round depending on food sources and produce 1 brood a year. They breed in colonies of up to 2000 pairs on cliffs, or in trees and bushes. Both male and female build the nest which is made from twigs, sticks, reeds, seaweed, moss, and debris.

Cormorants lay 2-6 pale chalky-blue or green eggs, which are incubated by both parents for 27 to 31 days. They place the eggs on their large, webbed feet underneath their body to keep them warm. Chicks are blind and altricial and are covered in black down. They are fed by both parents with a regurgitated liquid for a few days and then solid food brought to the nest.

They fledge 50 days after hatching but remain with their parents for another 50 days and reach sexual maturity at 3-5 years.

Feeding

Cormorants eat mostly fish but occasionally supplement their diet when in freshwater with crustaceans, amphibians or insects.

Cormorant

Where to see them

Cormorants are found around the coastlines of the UK on rocky shores, lagoons and estuaries. They can also spotted inland on lakes, reservoirs and gravel pits.

Listen

Szymon Pławecki/xeno-canto

Did you know?

In Norway cormorants are considered sacred birds and it is good look for cormorants to have them gather near your town or village.

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