Ad
related to: why do blackbirds migrate
Search results
Results From The WOW.Com Content Network
Birds of prey such as honey buzzards which migrate using thermals lose only 10 to 20% of their weight during migration, which may explain why they forage less during migration than do smaller birds of prey with more active flight such as falcons, hawks and harriers.
Female blackbirds in Scotland and the north of England migrate more (to Ireland) in winter than do the males. [23] Common over most of its range in woodland, the common blackbird has a preference for deciduous trees with dense undergrowth.
Birds do not begin their migration to wintering quarters until the two outer primary sprouts and the two inner or central rectrices have completed at least two-thirds of their development. Therefore, there is a correlation between molting, particularly replacement of the remiges and rectrices, and fall migration in red-winged blackbirds. [47]
Flocks of black birds have been spotted in backyards and parks over the past few weeks in the Triangle, causing many of us to do a double take when we leave our homes or pass a large, grassy field.
This type of migration is advantageous in birds that, during the winter, remain close to the equator, and also allows the monitoring of the auditory and spatial memory of the bird's brain to remember an optimal site of migration. These birds also have timing mechanisms that provide them with the distance to their destination. [10]
Many birds migrate in flocks. For larger birds, it is assumed that flying in flocks reduces energy costs. The V formation is often supposed to boost the efficiency and range of flying birds, particularly over long migratory routes. All the birds except the first fly in the upwash from one of the wingtip vortices of the bird ahead.
Milwaukee is under "high" migration alert Wednesday night, with more than 27,000 birds expected to migrate over the city. Kakatsch said colder weather usually drives an upswing in migration in the ...
A variety of small, colorful birds are making their way to Kentucky soon. Here’s advice from a local birding expert on what to look for. ‘Blindingly gorgeous’ spring birds will migrate to KY ...