• Alerstam, T. & Lindström, Å. (1990) Optimal bird migration: the relative importance of time, energy and safety. Bird Migration: Physiology and Ecophysiology (ed. E.Gwinner), pp. 331351. Springer Verlag, Berlin.
  • Bächler, E., Hahn, S., Schaub, M., Alrettaz, R., Jenni, L., Fox, J.W., Afanasyev, V. & Liechti, F. (2010) Year-round tracking of small trans-Saharan migrants using light-level geolocators. PLoS ONE, 5, e9566.
  • Bannasch, R., Wilson, R.P. & Culik, B. (1994) Hydrodynamic aspects of design and attachment of a back-mounted device in penguins. Journal of Experimental Biology, 194, 8396.
  • Barron, D.G., Brawn, J.D. & Weatherhead, P.J. (2010) Meta-analysis of transmitter effects on avian behaviour and ecology. Methods in Ecology and Evolution, 1, 180187.
  • Caccamise, D.F. & Hedin, R.S. (1985) An aerodynamic basis for selecting transmitter loads in birds. Wilson Bulletin, 97, 306318.
  • Gaunt, A.S., Oring, L.W., Able, K.P., Anderson, D.W., Baptista, L.F., Barlow, J.C. & Wingfield, J.C. (1997) Guidelines to the use of Wild Birds in Research. The Ornithological Council, Washington, DC.
  • Gill, R.E., Tibbitts, T.L., Douglas, D.C., Handel, C.M., Mulcahy, D.M., Gottschalck, J.C., Warnock, N., McCaffery, B.J., Battley, P.F. & Piersma, T. (2009) Extreme endurance flights by landbirds crossing the Pacific Ocean: ecological corridor rather than barrier? Proceedings of the Royal Society Series B, 276, 447458.
  • Guilford, T., Meade, J., Willis, J., Phillips, R.A., Boyle, D., Roberts, S., Collett, M., Freeman, R. & Perrins, C.M. (2009) Migration and stopover in a small pelagic seabird, the Manx shearwater Puffinus puffinus: insights from machine learning. Proceedings of the Royal Society Series B, 276, 12151223.
  • Hedenström, A. & Liechti, F. (2001) Field estimates of body drag coefficient on the basis of dives in passerine birds. Journal of Experimental Biology, 204, 11671175.
  • Hill, R.D. (1994) Theory of geolocation by light levels. Elephant Seals: Population Ecology, Behavior, and Physiology (eds B.J.Le Boeuf & R.M.Laws), pp. 227236. University of California Press, Berkeley.
  • Hobson, K. & Wassenaar, L. (2008) Tracking Animal Migration With Stable Isotopes. Academic Press, New York.
  • Maybury, W.J. & Rayner, J.M.V. (2001) The avian tail reduces body parasite drag by controlling flow separation and vortex shedding. Proceedings of the Royal Society of London Series B, 268, 14051410.
  • Obrecht, H.H., Pennycuick, C.J. & Fuller, M.R. (1988) Wind-tunnel experiments to assess the effect of back-mounted radio transmitters on bird body drag. Journal of Experimental Biology, 135, 265273.
  • Pennycuick, C.J. (1989) Bird Flight Performance: A Practical Calculation Manual. Oxford University Press, New York.
  • Pennycuick, C.J., Fuller, M.R. & Obrecht, H.H. (1988) Empirical estimates of body drag of large waterfowl and raptors. Journal of Experimental Biology, 135, 253264.
  • Phillips, R.A., Silk, J.R.D., Croxall, J.P., Afanasyev, V. & Briggs, D.R. (2004) Accuracy of geolocation estimates for flying seabirds. Marine Ecology Progress Series, 266, 265272.
  • Phillips, R.A., Catry, P., Silk, J.R.D., Bearhop, S., McGill, R., Afanasyev, V. & Strange, I.J. (2007) Movements, winter distribution and activity patterns of Falkland and brown skuas: insights from loggers and isotopes. Marine Ecology Progress Series, 345, 281291.
  • Rappole, J.H. & Tipton, A.R. (1991) New harness design for attachment of radio transmitters to small passerines. Journal of Field Ornithology, 62, 335337.
  • Robinson, D.W., Bowlin, M.S., Bisson, I., Shamoun-Baranes, J., Thorup, K., Diehl, R., Kunz, T., Mabey, S. & Winkler, D.W. (2010) Integrating concepts and technologies to advance the study of bird migration. Frontiers in Ecology and the Environment, in press.
  • Steinhausen, M.F., Andersen, N.G. & Steffensen, J.F. (2006) The effect of external dummy transmitters on oxygen consumption and performance of swimming Atlantic cod. Journal of Fish Biology, 69, 951956.
  • Stutchbury, B.J.M., Tarof, S.A., Done, T., Gow, E., Kramer, P.M., Tautin, J., Fox, J.W. & Afanasyev, V. (2009) Tracking long-distance songbird migration by using geolocators. Science, 323, 896896.
  • Tucker, V.A. (1990) Body drag, feather drag, and interference drag of the mounting strut in a peregrine falcon, Falco peregrinus. Journal of Experimental Biology, 149, 449468.
  • Watson, K.P. & Granger, R.A. (1998) Hydrodynamic effect of a satellite transmitter on a juvenile green turtle (Chelonia mydas). Journal of Experimental Biology, 201, 24972505.