As the last thermals of summer start to rise, the birds [hawks and vultures] circle up to great heights, 10,000 feet or more, to give themselves a good start for the long journey ahead. As they glide southwards, slowly losing height, they will look for another thermal and make for its base so that, once again, they will be lifted high enough to reach the next. (David Attenborough)

As the last thermals of summer start to rise, the birds [hawks and vultures] circle up to great heights, 10,000 feet or more, to give themselves a good start for the long journey ahead. As they glide southwards, slowly losing height, they will look for another thermal and make for its base so that, once again, they will be lifted high enough to reach the next.

David Attenborough

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base circle enough feet glide good great height high journey last losing next once reach rise start summer thermal heights

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