Which condition can cause female animals to become more aggressive towards other animals and humans?

Pregnancy can indeed lead to increased aggression in female animals toward other animals and humans due to a combination of hormonal changes and protective instincts. When a female is pregnant, her body undergoes significant hormonal shifts, such as increases in estrogen and progesterone, which can alter behavior. These hormonal changes can trigger heightened sensitivity, defensiveness, and irritability as the animal becomes preoccupied with the well-being of her unborn offspring.

Furthermore, this period instinctively drives the mother to protect herself and her future young from perceived threats, which may manifest as aggression towards those she perceives as intruders or dangers. This behavior is rooted in the natural instincts that promote the survival of not only the mother but also the developing fetus.

While hunting, mating season, and domestication can influence the behavior of animals, they do not typically induce the same level of aggression associated with the protective maternal instincts that occur during pregnancy.