@Misc{Wiki,
 howpublished = {\url{http://en.wikipedia.org/wiki/Upupa_epops}}
} 

@Book{Kooy2010,
 author = {Kooijman, S.A.L.M.},
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 title  = {Dynamic Energy Budget theory for metabolic organisation},
 publisher = {Cambridge Univ. Press, Cambridge},
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 howpublished = {\url{../../../bib/Kooy2010.html}}
} 

@Article{HildScha2017,
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 doi = {10.1111/ibi.12529},
 year = {2017},
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 journal = {Ibis},
 volume = {160},
 pages = {145-157}
} 

@Misc{AnAge,
 howpublished = {\url{http://genomics.senescence.info/species/entry.php?species=Upupa_epops}}
} 

@Misc{EoL,
 howpublished = {\url{http://eol.org/pages/917145/overview}}
} 

@Article{PrinPres1991,
 doi = {10.1016/0300-9629(91)90122-S},
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 title = {Body temperature in birds},
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 volume = {99A(4)},
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}