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Conspecific Patterns And Functions. Most frequently, males are aggressive to males; females are aggressive to females. Both adults can be aggressive to juveniles of either sex. Instances of male-to-female and female-to-male aggression also occur, but rarer than intrasexual aggression.

At a distance, starlings look black. In summer they are purplish-green iridescent with yellow beaks; in fresh winter plumage they are brown, covered in brilliant white spots. Starlings are boisterous, loud, and they travel in large groups (often with blackbirds and grackles).

In summer starlings have yellow bills and pale spots on their backs, which blackbirds, cowbirds, and grackles never have. In the winter starlings are covered in bright white spots that these other species lack.

The colorful and large bill, which in some large species measures more than half the length of the body, is the hallmark of toucans. Despite its size, the toucan's bill is very light, being composed of bone struts filled with spongy tissue of keratin between them.

There are birds that have colours in their genes that emerge from time to time, but the sparrow has no blue in it.Apr 26, 2009

A breeding male Indigo Bunting is blue all over, with slightly richer blue on his head and a shiny, silver-gray bill. Females are basically brown, with faint streaking on the breast, a whitish throat, and sometimes a touch of blue on the wings, tail, or rump. Immature males are patchy blue and brown.

Males are unmistakable, with indigo-blue plumage and yellow bill. Females are buff brown above and heavily streaked below; bill yellowish, with dusky upper edge. Usually encountered in rocky savanna habitats.

• The western bluebird has a blue (male) or gray (female) throat, the eastern bluebird has an orange throat, and the mountain bluebird lacks orange color anywhere on its body. It has a stocky build, and a thin straight beak with a fairly short tail.

• MARYLAND BIRDS. Bluebird, Eastern (Sialia sialis) Male Eastern Bluebirds have blue heads and wings, red throats and chests, and gray lower bodies, while females have gray heads and backs with gray-blue wings, brown chests, and white lower bodies. They eat insects, fruits, and occasionally, reptiles and amphibians.

• The Yellow-billed Blue Finch is a species of bird in the Thraupidae family. Sometimes classified in the bunting and American sparrow family Emberizidae, a recent study has shown it to belong in the Thraupidae. It in the monotypic genus Porphyrospiza.

• Known as Clowns of the Sea because of their multicolored beak, they are found in the United States and Canada. Their beak has the ability to change its color throughout the year and hence listed as one of the beautiful birds in the world.

The western bluebird has a blue (male) or gray (female) throat, the eastern bluebird has an orange throat, and the mountain bluebird lacks orange color anywhere on its body. It has a stocky build, and a thin straight beak with a fairly short tail.

MARYLAND BIRDS. Bluebird, Eastern (Sialia sialis) Male Eastern Bluebirds have blue heads and wings, red throats and chests, and gray lower bodies, while females have gray heads and backs with gray-blue wings, brown chests, and white lower bodies. They eat insects, fruits, and occasionally, reptiles and amphibians.

The Yellow-billed Blue Finch is a species of bird in the Thraupidae family. Sometimes classified in the bunting and American sparrow family Emberizidae, a recent study has shown it to belong in the Thraupidae. It in the monotypic genus Porphyrospiza.

Known as Clowns of the Sea because of their multicolored beak, they are found in the United States and Canada. Their beak has the ability to change its color throughout the year and hence listed as one of the beautiful birds in the world.