The fledgling and an adult with old brood patches were observed in June.

A nesting female also has a brood patch on the bare skin of the belly.

These reddish, well-vascularized areas of skin are usually called brood patches.

The eggs then attach themselves to a brood patch, which supplies them with oxygen.

The female will then develop a brood patch and incubate the eggs for 28 days or longer before they hatch.

Females alone develop brood patches and incubate, although both sexes feed the young.

The female alone displays a brood patch.

The female develops a brood patch of bare skin and plays the main part in incubating the eggs.

Females lay around 120 eggs onto the brood patch located on the underside of the males tail.

The female incubated the eggs, but the male apparently developed a brood patch, which indicates it contributed as well.

In frozen Alaska, snowy owls transfer heat to their eggs via a brood patch.

The incubating parent holds the egg against its brood patch with its wings.

Gulls and galliformes may have three brood patches.

Before nesting, the females of most bird species gain a bare brood patch by losing feathers close to the belly.

To provide warmth to the eggs, the parents will cover them with their large webbed feet, because like their relatives they lack a brood patch.

In species where both parents incubate, brood patches may develop in both sexes.

They lack a brood patch.

Zebra Finch incubation: brood patch, egg temperature and thermal properties of the nest.

In contrast, during the breeding season, fertile females develop oedematous brood patches, which are bare areas on their bellies.

Almost all the victims were said to be laughing gulls with brood patches on their bellies, a sign that the birds were breeding.

Brood parasitic cuckoos do not develop brood patches.

One study suggested a connection between the female's bill colour and breeding status, with birds that had a horn-coloured bill also having well-developed brood patches.

Warmth from parents passes to the eggs through brood patches, areas of bare skin on the abdomen or breast of the incubating birds.

After implantation in or on the brood pouch or brood patch, the male incubates the eggs.

Pelicans, penguins, boobies and gannets do not develop brood patches, but instead cradle the eggs on their feet when incubating.