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

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

@Misc{ADW,
 howpublished = {\url{http://animaldiversity.ummz.umich.edu/accounts/Lutra_lutra/}}
} 

@Book{Step1957,
 author = {Stephens, M. N.},
 year = {1957},
 address = {Herts},
 title  = {The otter report},
 publisher = {Universities Federation Animal Welfare}
}