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Every year, northern elephant seals set off on a seven-month, 6,000-mile (10,000-kilometer) journey across the North Pacific ocean in search of fish and squid to eat. They start the journey after sitting on the beach for a couple months – replacing their fur and losing fat – and gradually gain weight over the course of the foraging trip. On these excursions, elephant seals don’t just swim on the surface – they dive continuously, day and night. To rest, they swim down hundreds of meters below the ocean surface then slowly roll onto their backs and drift back and forth like falling leaves. These dives last around 25 minutes and are called drift dives. The resting period of drift dives is the most dangerous time for an elephant seal: Waking up in the jaws of a white shark or killer whale is not a good way to start the day.

Jessica kendallDanielle dubeUc santa cruz norris centerNorth pacificArt science residencyCruz norris centerNatural historyScience advancesJessica kendall barDan costaAnimal behaviorMarine mammalsPacific oceanRisk takingWhite sharksஜெசிகா கெஂடெல்