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

@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{bow,
 howpublished = {\url{https://birdsoftheworld.org/bow/species/grcgre1/cur/introduction}}
} 

@Misc{avibase,
 howpublished = {\url{https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=8F269702DC208010&sec=lifehistory}}
}