Why do the dolphins spin? | Atlantic: The Wildest Ocean on Earth
On a Brazilian island scientists study the world's largest spinner dolphin population.
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Flying spiders | Life in the Undergrowth
David Attenborough looks at gossamer threads made by baby money spiders. The spiderlings use this gossamer to travel by 'ballooning'.
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Baby ibex chased by fox | Planet Earth II
Vertiginous slopes keep ibex families safe from predators but they need to descend to flat ground to drink and this brings them in contact with a fox.