Over temporary land bridges cause by the Ice ages
Land bridges
EVERYWHERE!
Eastern Bluebirds migrate to Mexico in the winter.
Because they want freedom.
Penguins do not migrate. All penguin species are native to the Southern Hemisphere.
yes they did
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.
U use animal
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.
Most birds
Yes, they came from Europe, China and the Americas.
Because they think Americas will stop them.