Humans. Beside humans, they do not have many natural enemies. Naturally, some sharks and orcas prey on smaller dolphins. Dolphins also suffer from diseases and parasites. Back to the answer.HUMANS!!!!!!
What do humans do to threaten dolphins? We pollute.. pesticides, heavy metals, plastics and other pollutants build up in the bodies of marine life, causing many injuries and deaths. Dolphins also collide with boats and htier propellors.
We fish and unintentionally kill dolphins in the process (check seine fishing). Some people consume dolphin meat, but it is advised against for their meat is high in mercury.
We also create underwater noises, which can harm dolphins by making them stressed, damaging their hearing and cause decompression sickness.
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