Animal migration

Animal migration is when animals travel a long distance on a seasonal basis. Reasons for migration include climate, food, and mating.

Bird wings

All living species of birds have wings.

Bird species

There are near 10,000 bird species in the world.

Birds

Birds are warm-blooded animals.

Animalis

The word "animal" comes from the Latin word animalis. Animalis means "having breath".

Autotroph

An autotroph is an organism that can synthesize its food from inorganic substances by using heat or light as a source of energy. Plants and algee are examples of autotrophs.

Heterotroph

A heterotroph is an organism that cannot make its own food from inorganic materials. They must rely on organic substances for nutrition. All animals are heterotrophs.

Vertebrate

A vertebrate is an animal that has a backbone. Birds, reptiles, and mammals are some examples.

Invertebrate

An invertebrate is an animal that has no backbone. Some examples are worms and spiders.