Abstract
REFERRING to NATURE, vol. xxiii. p. 10, may I suggest the following?—The question seems to be: “How can birds, having attained a certain elevation, thence rise without further muscular effort?” If I am not in error in what follows, they can theoretically do so if they start with a difference between their horizontal velocity and that of the wind, and end with a less difference; e.g., if they start at rest with respect to the earth, and end by drifting with the wind entirely.
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LARDEN, W. Soaring of Birds. Nature 23, 77–78 (1880). https://doi.org/10.1038/023077e0
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DOI: https://doi.org/10.1038/023077e0
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