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USGS Bird Population - Essay Example

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The paper "USGS Bird Population" discusses that it is easier for an individual to identify generalist birds than a specialist. For generalists, one way to identify them is by how they adapt to the environment. They can adapt to a new environment considering that the ecosystem is being chopped up…
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USGS Bird Population
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The red-winged blackbirds are categorized as generalist birds because they can adapt to different environments. The red-winged blackbirds are found in Southern Alaska, the Yucatan peninsula, Canada, and California. The birds keep migrating to various parts of the continent depending on the season. During winter, the birds migrate to the southern and central parts of the United States. They inhabit open grassy areas such as wetlands. They also inhabit saltwater and freshwater marshes especially if cattail is present Great Blue Heron The Great Blue Heron species have characteristics that make them categorized as specialists.

It is among the large wading birds in the Heron family. Great Blue Herons have distinct features such as reddish brown thighs, light feathers, and grey rusty necks. They have long green legs with the males having a puffy trail of feathers behind the head. The males are lighter than the female. The birds are rare to find and do not easily adapt to new ecosystems (Peterson, 2010). Unlike the other birds, the Great Blue Heron fish for food during the day and at night. They like doing most of their activities early in the morning and at dusk.

The birds feed on fish, salamanders, snakes, and frogs, among other aquatic insects. Herons swallow their food as a whole after they catch them. The birds cannot feed on other food apart from aquatic food, which is a characteristic of specialists. They have unique behavior since most of the activities are either done in the morning or at dusk. The herons are said to be private, and never hunt in groups. However, during breeding, the birds do so in groups. When not hunting, the birds sleep in a flock of about one hundred.

The birds are extremely territorial and always defend their nests. American Dipper The American Dippers are specialists. It is a thick dark, gray bird with some having a brown head and white feathers on the eyelids. The white eyelids cause the eyes to flash white as they blink. Both males and females look alike. They have short tails that are often raised. American Dipper feeds on insects and their larvae, small fish, and fish eggs. They look for food in water or at times turn a rock to expose the prey.

For them to survive in such conditions, the birds have lots of feathers, slow metabolism, and the ability to carry oxygen for a long time. The birds prefer living on rocky and unpolluted streams. Cliffs on the stream or bridges help them build nests. However, the birds prefer to build their nests on mountainous streams. This is a characteristic of specialist species. They can survive in cold climates and can eat only insects on land and fish (Ross, 2011). American Robin American Robin can live on the road, and in the forest which is a characteristic of generalists.

The type of bird can survive in both cold and hot climates which is another characteristic of a generalist. The bird is a member of the thrush family and the name American Robin came about because the bird resembles a similar bird in Great Britain. Most of them feed on berries, worms, insects, and larvae. Most of them are seen looking for worms which they take to their young ones. American Robins live in forests, urban areas, and on roadsides. Birds can survive in different ecosystems (Ralph, Sauer, & Droege, 2012).

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