CHRISTOPHER SWANN / SCIENCE PHOTO LIBRARY CHRISTOPHER SWANN / SCIENCE PHOTO LIBRARY
Whale watching. Tourists stroking the head of a gray whale (Eschrichtius robustus). This whale can grow up to 15 metres in length and weigh 16 tonnes. It feeds on crustaceans and worms from sediment on the sea floor. Photographed in the Pacific Ocean, off Mexico.
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