Bald eagles can be aggressive, but usually only towards their prey or threats to their territory or offspring. They are territorial, particularly during breeding season, and will defend their nests from potential predators, including other eagles. However, they generally avoid humans unless threatened. Their hunting behavior, such as snatching fish or stealing food from other animals, can appear aggressive. It's crucial to respect their space, especially during nesting season, and remember they are often legally protected species.