Today Moscow Zoo is home to 1,000 species and more than 6,000 animals.
Among them there are tigers. They are now threatened with extinction.
Tigers live in different climates - from tropical rain forests to cold mountain forests . The tigers stripes are good camouflage in the forests where they live.
But people cut the trees and tigers sometimes enter the villages looking for food.
Villagers often kill tigers because they are frightened of them.
That's how these beautiful strong animals have become very rare species . Zoos help to save them.
how do zoos help animals? Zoos help the animals by putting them in captivity, supplying them with food and a suitable habitat.