because it is to cold for them or to raise their chicks some were warm.
a ground hog like animal. the migration is it makes shadows of its-self
More than 1000 different species.
thousand and thousands
There is such thing as a migrating penguin, but different species migrate at different times and for different amounts of time. The African penguin is non-migratory and lives in burrows. Emperor penguins migrate over 1mile in a long line. Usually they migrate for breeding and mating seasons and all accumulate in one place. On average they travel 1,125 miles per journey. Many start migrating in spring.
There are approximately 10,000 different species of birds in the world. Each species belongs to a specific family, genus, and species.
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.
Biodiversity
There were many species of Gorgonopsids, and each one had a different weight.
There are many different species of dolphin, so it varies for each one.
There are a great many different species of birds that coexist. Finches, robins, and blue birds all coexist with each other for example.
Becuase of some insects
They don't hibernate as such... but many species DO migrate to warmer countries in winter.