Dolphins are sometimes victims to sharks or killer whales. However, their most dangerous threat is the man.
The conservation status of up to 25% of the dolphin species is vulnerable or worst. Pollution, fishing, and hunting are factors that affect the development and survival of these cetaceans.
Several private and public organizations work tirelessly to preserve all species of dolphins, but it is not an easy task when humans are the greatest obstacle.
The only predator that the small species of dolphins or calves have in the ocean are the large species of sharks.