Griffon vultures depend on sun to fly

This video says about itself:

Griffon Vultures Depend on the Sun to Fly. Why?

The Griffon vulture is one of the largest vulture species. Because of its giant stature, it uses an immense amount of energy to take off. Luckily, these birds have found a way to use the rising currents of hot air to their advantage. From: DAVID ATTENBOROUGH‘S CONQUEST OF THE SKIES: Triumph.

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