Many North American species, especially in the Arctic and boreal regions, are similar to Eurasian wildlife.
The Nearctic realm is divided between four bioregions, making up the northern, western, eastern and southern part of the continent.
The north, also known as the Canadian shield is made up by tundra and boreal forest. The harsh winters put pressure on animals and plants here, limiting the number of species.
The west is contained by the Rocky Mountains. With great variations in elevation, temperature and rainfall, the differences within the region are great.
The east makes up the eastern United States, as well as southeastern Canada, and the Canadian Prairie.
The south includes inland Mexico, as well as the desert region of the United States, and Texas.
North America is famous for its many carnivores, especially bears, wolves, foxes, coyotes, lynx, and cougars.
They make up keystone species for their ecosystems. Many of them have been endangered, or locally extinct during the 20th century, but are currently recovering.
The American bison, Bison bison, is the heaviest endemic land animal on the continent. It used to be a dominant species of the Great Plains until modern times. At the brink of extinction near 1900, the population is on the rise again.
The mustangs are a population of feral horses (Equus ferus caballus) on the Great Plains, descending from colonists' horses.
Many birds of the continent are migratory, and can only be seen seasonally.