As an expert in animal behavior, I can tell you that there are several factors that contribute to the aggressive behavior observed in bulls.

Firstly, bulls are naturally territorial animals. They will defend their space and herd from perceived threats, which can include other bulls or even humans. This territoriality is a survival instinct that has been honed over thousands of years of evolution.

Secondly, bulls have been bred by humans for various purposes, including as fighting bulls in some cultures. This selective breeding can result in certain breeds being more aggressive than others due to the emphasis on traits like size, strength, and aggression.

Thirdly, bulls are also influenced by hormones. Testosterone, in particular, can play a significant role in aggressive behavior. Bulls in their prime, during the breeding season, can be more prone to aggression due to higher levels of this hormone.

Lastly, bulls' aggressive behavior can be a learned response. If a bull has been subjected to negative experiences, such as abuse or mistreatment, it may become more aggressive as a form of self-defense.

In summary, the aggression in bulls is a complex behavior influenced by a combination of natural instincts, genetic traits, hormonal influences, and environmental factors.

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The bull's bellicosity basically boils down to three root causes: a bull's natural disposition as a result of the animal's social structure, generations of bulls bred for aggression, and isolation from a herd. Cattle are herd animals. ... The Spanish fighting bull is a breed known particularly for being a brawler.read more >>