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Whales and tuna fishermen are the predators for dolphins. The dolphins follow schools of tuna so the large tuna boats look for tuna by looking for dolphins. They set huge nets to catch the tuna, but the dolphins get caught up in the nets and because they are mammals they drown in the net. Many tuna companies say they don't do this anymore, but that isn't necessarily true. You can see video on this if you want to see what happen to the dolphins.

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