How do birds know to fly south for the winter?

  1. grinnin1 profile image81
    grinnin1posted 6 years ago

    How do birds know to fly south for the winter?

  2. onegoodwoman profile image77
    onegoodwomanposted 6 years ago

    They are just friggin smart that way..............or, perhaps,

    they are given a sense of knowing when to move on, by their Master.

    Perhaps humans, should hear this sense of moving on....

    OR maybe, we should be more in tune with the voice of our Master.

    It was YOU, who asked!

  3. auspicious12day profile image60
    auspicious12dayposted 6 years ago

    Climate changes
    Lack of needed resources
    Competition between species for food, nest sites or other resources.
    Seasonal tracking of fruit (hummingbirds) or nectar.

    They have internal biological clocks- circadian rhythms. Hummingbirds fatten up their body for the long flight.

    Most birds migrate at night. Sometimes it is a twenty-four flight to cross ecological barriers like the Gulf of Mexico. Then they will fly both day and night.