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} 

@Book{Kooy2010,
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} 

@article{Snow1970,
 doi = {10.1111/j.1474-919X.1970.tb00109.x}author = {Barbara K. Snow},
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 title = {A FIELD STUDY OF THE BEARDED BELLBIRD IN {T}RINIDAD},
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} 

@Misc{avibase,
 howpublished = {\url{https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=C5682CE468C95F4D&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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}