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Dolphins are very clever and friendly animals.

There are more than 40 species of dolphins.

Dolphins have already become extinct.

Environmental pollution, noise pollution, habitat destruction and industrial fishing threatens dolphins.

Dolphins can get enough food in the sea.

The United Nations declared 2007 the Year of the Dolphins.

The aim of the campaign was to make people aware of the many threats dolphins faced.

Patron of the Year of the Dolphin was Prince Charles.