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الموسم 1، الحلقة 4: When glass frogs emerge during the rainy season, researchers at the Smithsonian Tropical Research Institute follow their migration out of the forest and along streams. These transparent leaf-lying frogs are mysterious to experts who are only now starting to track their mating rituals and behavior.
Documentary · 16 ديسمبر 2015 · 4 دقائق