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Animal migration is the relatively long-distance movement of individual animals, usually on a seasonal basis. It is the most common form of migration in ecology. It is found in all major animal groups, including birds, mammals, fish, reptiles, amphibians, insects, and crustaceans. The cause of migration may be local climate, local availability ...
Adaptation is the evolutionary process whereby an organism becomes better able to live in its habitat or habitats. [25][26][27] 2. Adaptedness is the state of being adapted: the degree to which an organism is able to live and reproduce in a given set of habitats. [28]
As with other small birds, infection by parasites and diseases, and predation by birds of prey take their toll, and the typical life span is about two years. The Eurasian tree sparrow is widespread in the towns and cities of eastern Asia , but in Europe , it is a bird of lightly wooded open countryside, with the house sparrow breeding in the ...
Bird song is an example of learned territorial defense. Studies show that birds with high-quality songs will use them as a stimulus to deter predators from their territorial range. [ 13 ] Higher quality songs have been proven to act as the best defense mechanism in a variety of bird species, such as the red-winged blackbird ( Agelaius ...
In evolutionary biology, sympatric speciation is the evolution of a new species from a surviving ancestral species while both continue to inhabit the same geographic region. In evolutionary biology and biogeography, sympatric and sympatry are terms referring to organisms whose ranges overlap so that they occur together at least in some places.
Habitat can be defined as the natural environment of an organism, the type of place in which it is natural for it to live and grow. [4][5] It is similar in meaning to a biotope; an area of uniform environmental conditions associated with a particular community of plants and animals.
Migration, in ecology, is the large-scale movement of members of a species to a different environment. Migration is a natural behavior and component of the life cycle of many species of mobile organisms, not limited to animals, though animal migration is the best known type. Migration is often cyclical, frequently occurring on a seasonal basis ...
Red-billed queleas, the most numerous species of wild bird, [196] form enormous flocks – sometimes tens of thousands strong. While some birds are essentially territorial or live in small family groups, other birds may form large flocks. The principal benefits of flocking are safety in numbers and increased foraging efficiency. [77]