longer days in spring
longer days in spring
WINTER.
It depends entirely upon the species but MOST migratory northern hemisphere birds migrate south, and MOST migratory southern hemisphere birds migrate north. But that is a huge over-simplification.
change in temperature! i do novanet as well ^_^
humming birds migrate the same way the other birds do. Like when it is cold in north they fly south and when it is cold in the south they fly north.
Birds migrate to Florida for winter because up north, the winter gets very cold and the birds don't like being so cold, so they fly south for winter where its not so cold as up north.
Birds that migrate generally do so on a North-South axis. Many birds that live on the Asian continent migrate throughout Asia. It would be unlikely, or "accidental," for birds from, for example, North America, to migrate to Asia.
They can migrate to different regions. The birds in the Northern hemisphere go south during winter. The birds in the Southern hemisphere go north during winter. They migrate towards the equator.
Birds that migrate are called migratory birds. Birds that do no migrate are called sedentary birds. Over 4000 species of birds migrate, mostly those native to colder regions.
Wolves do not actually migrate but will follow herds of prey animals that pass through their territory.
Geese, robins, North American hummingbirds (particularly those in the eastern US), many passerine birds.
To changes in the magnetic field and to their ancestral feeding and breeding grounds.
Birds migrate to the North in response to seasonal changes in temperature and food availability. They follow migration routes that lead them to areas where they can find suitable breeding grounds and abundant food sources.