Dolphins are not frequent victims of any predator in the ocean due to their sociability and intelligence, but killer whales and some large sharks are their main natural threat.
Each Killer whale population has a different niche in their habitat and consume different resources, however all are the apex predators of the place they live.
Dolphins are sometimes victims to sharks or killer whales. However, their most dangerous threat is the man.
Dolphins have helped people in many ways and there is a large number of accounts about dolphins helping people since the ancient Greece
Dolphins protect themselves trough a sophisticated social structure which make dolphins swim and live together in small groups called pods or schools