What is a typical behavior in an animal that feels threatened?

Aggressive posturing is a common behavior exhibited by animals feeling threatened. When an animal perceives a potential danger, its natural instinct may lead it to adopt an aggressive stance as a means of self-defense. This posturing can include behaviors such as growling, baring teeth, puffing up to look larger, or any display meant to deter a perceived threat. This reaction is a survival mechanism intended to either intimidate the threat or prepare the animal to defend itself if necessary.

In contrast, options like calm demeanor, curious exploration, and obedient behavior do not typically align with a response to perceived danger. A calm demeanor suggests that the animal is relaxed and not threatened, curious exploration indicates a sense of safety and willingness to investigate surroundings, and obedient behavior usually reflects a trained response rather than instinctual behavior prompted by fear. Therefore, aggressive posturing stands out as the most fitting reaction when an animal feels threatened.