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

@Book{Kooy2010,
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 publisher = {Cambridge Univ. Press, Cambridge},
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@article{Garg1972,
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 author = {Gargett, V.},
 year = {1972},
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} 

@Misc{KempKirw2020,
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 author = {Kemp, A. C. and G. M. Kirwan and P. F. D. Boesman},
 year = {2020},
 title = {Verreaux's Eagle (\emph{Aquila verreauxii}), version 1.1. In Birds of the World (S. M. Billerman and B. K. Keeney, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA}
} 

@Misc{avibase,
 howpublished = {\url{https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=14F13C32872CBA1C&sec=lifehistory}}
} 

@Article{PrinPres1991,
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 author = {R. Prinzinger and A.Pre{\ss}mar and E. Schleucher},
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 title = {Body temperature in birds},
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 volume = {99A(4)},
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}