CHRISTOPHER SWANN / SCIENCE PHOTO LIBRARY CHRISTOPHER SWANN / SCIENCE PHOTO LIBRARY
Whale watching. Tourists watching a blue whale (Balaenoptera musculus) passing their boat. The blue whale is the world's largest animal and can reach lengths of 27 metres and weigh 120 tonnes. It feeds on small crustaceans, such as krill. Photographed in the Gulf of California.
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