Answer:


Besides the common predators like big sharks and occasionally killer whales, humans are the top dolphin killers.

The human activities that kill dolphins are tuna fishing because dolphins get trapped in the nets while they try to pursuit tuna too.

Also, human pollution is a huge threat for dolphins causing them to choke by eating waste or by damaging their senses and making them easy prey for sharks.

The intense noise caused by human activities has been catalogued as a threat for dolphins, as it has been proved that noise can kill dolphins or at least confuse them.

 

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