- Sharks: Sharks are one of the biggest natural predators of dolphins, so it's natural for dolphins to be wary of them. Dolphins may use echolocation to detect sharks and other predators in the water and avoid them.
- Killer Whales: Killer Whales (Orcas) are another natural predator of dolphins. Dolphins may use their social structure and speed to avoid and deter Killer Whales.
- Humans: Humans are a significant threat to dolphins due to overfishing, habitat destruction, and pollution. Dolphins may be cautious around humans due to negative interactions in the past.
- Loud Noises: Dolphins have sensitive hearing and may be disturbed or frightened by loud noises, such as boat engines, sonar, and underwater construction.
- Sudden Movements: Dolphins may be wary of sudden movements, such as those made by fast-moving boats or other unfamiliar objects.
- Captivity: Dolphins that have been captured and kept in captivity may experience fear and stress due to confinement, separation from their social group, and lack of freedom.