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

@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}}
} 

@Misc{DuncDunc2020,
 doi = {10.2173/bow.nohowl.01},
 author = {Duncan, J. R. and P. A. Duncan},
 year = {2020},
 title = {Northern Hawk Owl (\emph{Surnia ulula}), version 1.0. In Birds of the World (S. M. Billerman, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA}
} 

@Misc{avibase,
 howpublished = {\url{https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=89F8B6F5598E0C65&sec=lifehistory}}
} 

@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}
}