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Profesionální potápěč se žraloky Eli Martinez a vědec Matthew Smukall zjišťují, zda žraloci mění své chování, když zapadne slunce. (National Geographic)
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Photo © National Geographic Channel
Photo © National Geographic Channel
Photo © National Geographic Channel
Photo © National Geographic Channel
Photo © National Geographic Channel
Photo © National Geographic Channel
Photo © National Geographic Channel
Photo © National Geographic Channel