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An example is the migration of continental populations of Swainson's thrush Catharus ustulatus, which fly far east across North America before turning south via Florida to reach northern South America; this route is believed to be the consequence of a range expansion that occurred about 10,000 years ago. Detours may also be caused by ...
The ducks are fairly common within their restricted range; they are resident all-year round and do not migrate. Their breeding habitat is brackish and intermediate coastal marshes, but they will also use human developed habitat such as retaining ponds, water impoundments, and agricultural land during the breeding season. [ 3 ]
[124] [132] In summary, the problems of mallards "hybridising away" relatives is more a consequence of local ducks declining than of mallards spreading; allopatric speciation and isolating behaviour have produced today's diversity of mallard-like ducks despite the fact that, in most, if not all, of these populations, hybridisation must have ...
Got hummingbirds in your yard? Learn everything you wanted to know about how they survive and where they go when the weather turns cold.
CHICAGO — Bird migration is on the rise, and so are window collisions. As temperatures slowly drop in Chicago, 300 millions to 400 million birds are crossing the continent heading south to their ...
Most hummingbirds migrate in the winter to Central America or Mexico, but some hummingbirds spend the winter on the Gulf Coast and may be found in South Texas and South Louisiana during mild winters.
Waterfowl flyways in the United States. The Atlantic Flyway is in violet. The Atlantic Flyway is a major north-south flyway for migratory birds in North America. The route generally starts in Greenland, then follows the Atlantic coast of Canada, then south down the Atlantic Coast of the United States to the tropical areas of South America and the Caribbean. [1]
Migration encompasses four related concepts: persistent straight movement; relocation of an individual on a greater scale (in both space and time) than its normal daily activities; seasonal to-and-fro movement of a population between two areas; and movement leading to the redistribution of individuals within a population. [5]