As the largest country in the world, Russia is inhabited by a significant proportion of the animals which live on the planet. There are more than 1550 species of vertebrate animals. However, the diversity of species of wildlife has significantly reduced, primarily due to humans. Many of the species have disappeared over the past two centuries. A lot of representatives of the Russian fauna can only be seen today in the pictures of encyclopedias. A large-horn deer inhabited the vast territory stretching from Ireland to North Africa. In Russia, the skeletons of this mammal are often
found in the Ryazan and Sverdlovsk regions, in the Republic of Crimea and the North Caucasus. Scientists suggest that the large-horn deer completely disappeared about 7.6 thousand years ago. This deer lived in open spaces because of the huge horns, which can reach a weight of 37 kilograms, and have a length of up to 4 meters. In the forest, such bulky horns could interfere with its ability to hide from enemies. Now scientists believe that the disappearance of this species of deer was a natural process due to climate change.