Whales and Dolphins

More than 350 scientists and conservationists from 40 countries have signed a letter calling for global action to protect whales, dolphins and porpoises from extinction.

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They say more than half of all species are of conservation concern, with two on the "knife-edge" of extinction.

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Lack of action over polluted and over-exploited seas means that many will be declared extinct within our lifetimes, the letter says.

Even large iconic whales are not safe.