A zoo, also known as a zoological park or a zoological garden, gives people the opportunity to watch animals from different continents. There are hundreds of zoos all over the world. However, most of them are located in major cities. The first zoo in Russia was opened in 1864, in Moscow. It was a small zoological garden. On the opening day, only 287 animals were on display. Nowadays, the Moscow Zoo is one of the largest in Europe. The unique collection of the Zoo includes over 8000 kinds of animals and birds. Scientists study the animals’ behavior and reproduction. They also breed rare animals there to stop them dying out.