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

@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{MariStil1993,
 author = {Manuel Mar\'{i}n and F. Gary Stiles},
 year = {1992},
 title = {On the biology of five species of swifts ({A}podidae, {C}ypseloidinae) in {Cost} {R}ica},
 journal = {Proceedings of the Western Foundation of Vertebrate Zoology},
 volume = {7(1)},
 pages = {286-351}
} 

@Misc{avibase,
 howpublished = {\url{https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=50222B1F0367C7EA&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}
}