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Of course, in the southern hemisphere, the directions are reversed, but there is less land area in the far south to support long-distance migration. [ 19 ] The primary motivation for migration appears to be food; for example, some hummingbirds choose not to migrate if fed through the winter. [ 20 ]
A few hundred species migrate long distances, in some cases of thousands of kilometres. About 120 species of fish, including several species of salmon, migrate between saltwater and freshwater (they are 'diadromous'). [22] [23] Forage fish such as herring and capelin migrate around substantial parts of the North Atlantic ocean.
Here's when they'll migrate south. Show comments. Advertisement. Advertisement. Holiday Shopping Guides. See all. AOL. The best stocking stuffers for women. AOL.
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]
Including the Mexican duck in the mallard is a relic from the usual practice of much of the mid-late 20th century, when all North American "mallardines" as well as the Hawaiian and Laysan ducks were included in the mallard proper as subspecies.
The mallard has hybridised with more than 40 species in the wild, and an additional 20 species in captivity, [13] though fertile hybrids typically have two Anas parents. [14] Mallards and their domestic conspecifics are fully interfertile; many wild mallard populations in North America contain significant amounts of domestic mallard DNA. [15] [16]
When juveniles are capable of flight around 26–28 days after hatching, parent birds begin leaving to migrate south. [10] Females usually depart first. Flocks of juveniles remain, making the migration sometimes as late as October and November depending on Arctic weather.