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Having spent the winter holed up in mountain ranges, these wild, male horses release their pent-up energy to fight each other for the first mating rights of the spring.
The stallions rear up on their hind legs and land blows on one another with their powerful hooves in a stunning battle to win the dominance of their wild herd.
Each scrap often ends up with blood being drawn from the feral horses that roam the open ranges of the Cincar mountains in Bosnia.
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In a classic case of nature's survival of the fittest, the testosterone-driven winner gets to mate with the females of the herd while the loser goes away to lick their wounds.
The dramatic scenes were captured for the first time on camera by wildlife photographer Vedran Vidak, who spends hours patiently observing the horses' behaviour.
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Vedran, 39, said the males are more aggressive at this time of year as they vie for female attention.
He said: 'During the winter, the horses hide in the mountain and preserve their strength. In the spring time, the horses begin to release the energy they have been collecting.
'Since they live in nature on their own, they truly live by the rules of Darwin's theory of the survival of the fittest. As much as they are beautiful, they cannot hide their wild nature and their basic instincts.
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'Their fights represent the battle for the dominant role in the herd. In this specific situation there are a lot of males and the number of mares is decreasing.
'Thus, each stallion has to show off. He has to prove that he is the dominant stallion and that his strength and perseverance are incomparable.'
There are around 200 horses on the open ranges of the Cincar mountains of which about 20 are young colts.
source: dailymail