If you are surrounded by predators, it is dangerous to sleep, but the elephant seals have found their own fascinating solution. They dive down towards...
Text: Cecilia Klintö/TT
Foto: John Burgess/AP/TT, Eric Risberg/AP/TT, Jessica Kendall-Bar/University of California, Santa Cruz/TT
Grafik: Anna-Lena Lindqvist/TT