CHRISTOPHER SWANN / SCIENCE PHOTO LIBRARY CHRISTOPHER SWANN / SCIENCE PHOTO LIBRARY
Fin whale (Balaenoptera physalus) exhaling through its blow-hole, near a coastline. Whales dive to feed, coming to the surface for air. This whale can grow up to 27 metres in length and weigh 70 tonnes. It is a filter-feeder, feeding on small fish, squid, and crustaceans. Dive times are normally 10 to 15 minutes, and the blowhole spout can reach heights of 6 metres. Photographed in the Gulf of California.
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