What triggers facultative winter migration of Great Bustard (Otis tarda) in Central Europe?

@article{Streich2005WhatTF,
  title={What triggers facultative winter migration of Great Bustard (Otis tarda) in Central Europe?},
  author={Wolf Juergen Streich and Heinz Litzbarski and B. Ludwig and Stefan H.-M. Ludwig},
  journal={European Journal of Wildlife Research},
  year={2005},
  volume={52},
  pages={48-53}
}
The Great Bustard is on the brink of extinction in Central Europe. Its population is known to suffer high mortality during hard winters, particularly when severe weather conditions cause migration. Long-term winter food management in two populations in Germany did not prevent migration events. To identify migration-triggering factors we tested the potential influence of snow, temperature, phase of winter and development of a tradition of migration. Comparing migratory behaviour with long-term… CONTINUE READING

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