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