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How do Bulls Battle over Mates?

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This time of year, bulls are competing for the right to breed. They display their fitness in the most dramatic fashion.

TRANSCRIPT

- [Narrator] This time of year, bulls are competing for the right to breed.

And they display their fitness in the most dramatic fashion, kicking clouds of dust into the air as they urinate and then roll their 2000-pound bodies against the bare earth.

This bull is sending a message.

It's a chemical billboard.

It tells the other bulls he is at the peak of his game.

One of the large bulls is sticking close to the calf's mother, tending her, but he's treading a difficult path.

He's surrounded and the competition is stiff.

If he wants to keep her to himself, he's going to have to prove that he can.

It's a deadly serious game.

The success of future generations depends upon the outcome of these gladiatorial battles.

And as the two bulls exhaust themselves, someone seizes an opening (bison running) Amidst the chaos, the calves seek comfort in each other.

And as with every competition, there is a victor.

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