The paradox of extreme high-altitude migration in bar- headed geese Anser indicus by L. A. Hawkes, S. Balachandran, N. Batbayar, P. J. Butler, B. Chua,

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The paradox of extreme high-altitude migration in bar- headed geese Anser indicus by L. A. Hawkes, S. Balachandran, N. Batbayar, P. J. Butler, B. Chua, D. C. Douglas, P. B. Frappell, Y. Hou, W. K. Milsom, S. H. Newman, D. J. Prosser, P. Sathiyaselvam, G. R. Scott, J. Y. Takekawa, T. Natsagdorj, M. Wikelski, M. J. Witt, B. Yan, and C. M. Bishop Proceedings B Volume 280(1750): January 7, 2013 ©2013 by The Royal Society

Satellite tracks of migrating bar-headed geese: (a) three-dimensional map showing release locations (black crosses) of bar-headed geese in India (n = 2 sites) and Mongolia (n = 1 site). L. A. Hawkes et al. Proc. R. Soc. B 2013;280: ©2013 by The Royal Society

Timing and altitude of locations: histograms showing relative frequencies (densities) of (a,b) timing of locations and (c,d) altitudes for (a,c) migrating and (b,d) stationary bar-headed geese (e.g. during stop-over events, breeding and wintering). L. A. Hawkes et al. Proc. R. Soc. B 2013;280: ©2013 by The Royal Society

Bar-headed goose migration and altitude: map showing GPS locations received from bar-headed geese (black dots) on the Tibetan Plateau (the Himalayan mountains are in northern Nepal near the southern Chinese border). L. A. Hawkes et al. Proc. R. Soc. B 2013;280: ©2013 by The Royal Society

Bar-headed goose flight ground speeds. L. A. Hawkes et al. Proc. R. Soc. B 2013;280: ©2013 by The Royal Society

Winds experienced by migrating bar-headed geese: wind patterns (mean wind speed and direction) during (a) southward migration (1 October–31 December) and (b) northward migration (1 March–31 May), where arrows indicate wind speed and direction (largest arrow... L. A. Hawkes et al. Proc. R. Soc. B 2013;280: ©2013 by The Royal Society