Fight between a dominant stallion and a male rival

The dominant stallion fights off one of the frequent and aggressive thrusts of a colt which irrevocably tries to take over stallion's natural position in their herd. This depicts internal conflict between stallions and colts where the latter tries to win the primacy in the herd of all the mares. In a word, this gives us an impression of the survival of species and their internal conflicts which result in a perfect harmony of natural hierarchy. Those horses allow us to see their strength which is necessary for survival in a dangerous coexistence with wild animals and their frequent attacks. (National Geographic)