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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]
In the southern hemisphere, the directions are reversed, but there is less land area in the far south to support long-distance migration. [16] The primary motivation for migration appears to be food; for example, some hummingbirds choose not to migrate if fed through the winter. [17]
Mallard: Anas platyrhynchos: Anatidae: 6,400 metres (21,000 feet) This height was recorded over Nevada; [1] [4] [5] This record occurred when a Lockheed L-188 Electra turboprop airliner operating a Western Airlines flight suffered a bird strike at cruising altitude. [8] Bar-tailed godwit: Limosa lapponica: Scolopacidae: 6,000 metres (20,000 ...
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.
By the time they are ready to migrate, they are often so heavy they can barely fly. The timing of migration appears to be triggered by day-length only. This is why it is OK to keep feeders out ...
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.
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'). [23] [24] Forage fish such as herring and capelin migrate around substantial parts of the North Atlantic ocean.
Here are some tips for helping them migrate and for spotting stragglers. ... Here's when they'll migrate south. Show comments. Advertisement. Advertisement. In Other News. Entertainment.