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

@Book{Kooy2010,
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 title  = {Dynamic Energy Budget theory for metabolic organisation},
 publisher = {Cambridge Univ. Press, Cambridge},
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} 

@Misc{avibase,
 howpublished = {\url{https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=D23A3F75CCD56E6B&sec=lifehistory}}
} 

@Misc{KnoxLowt2020,
 doi = {10.2173/bow.hoared.01},
 author = {Knox, A. G. and P. E. Lowther},
 year = {2020},
 title = { (2020). Hoary Redpoll (Acanthis hornemanni), version 1.0. In Birds of the World (S. M. Billerman, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA}
} 

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

@Article{PrinPres1991,
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 author = {R. Prinzinger and A.Pre{\ss}mar and E. Schleucher},
 year = {1991},
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}