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

@Book{Kooy2010,
 author = {Kooijman, S.A.L.M.},
 year = {2010},
 title  = {Dynamic Energy Budget theory for metabolic organisation},
 publisher = {Cambridge Univ. Press, Cambridge},
 pages = {Table 4.2 (page 150), 8.1 (page 300)},
 howpublished = {\url{../../../bib/Kooy2010.html}}
} 

@Article{Hous1976,
 author = {D. C. Houston},
 doi = {10.1111/j.1474-919X.1976.tb02008.x},
 year = {1976},
 title = {BREEDING OF THE WHITE?BACKED AND R\"{u}PPELL'S GRIFFON VULTURES, \emph{Gyps africanus} AND \emph{G. rueppellii}},
 journal = {Ibis},
 volume = {118},
 pages = {14--40}
} 

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

@Misc{arkive,
 howpublished = {\url{https://www.arkive.org/white-backed-vulture/gyps-africanus/}}
} 

@Book{Tarb2014,
 author = {W. Tarboton},
 year = {2014},
 title  = {Roberts nests and eggs of southern {A}frican birds},
 publisher = {Trustees of the John Voelcker Bird Book},
 address = {Cape Town}
} 

@Article{PrinPres1991,
 doi = {10.1016/0300-9629(91)90122-S},
 author = {R. Prinzinger and A.Pre{\ss}mar and E. Schleucher},
 year = {1991},
 title = {Body temperature in birds},
 journal = {Comp. Biochem. Physiol.},
 volume = {99A(4)},
 pages = {499-506}
}