Thermal soaring of raptors

I read D r C. J . Henty's paper on thermal soaring of raptors (Brit. Birds 70: 471-475) with interest, and not a little surprise. I t has long been known by ornithologists that raptors use thermals for soaring, and, likewise, it has been known by meteorologists that thermals depend for their existence upon surface heating. I was surprised to find that no-one h a d

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