Wenny D G, DeVault T L, Johnson M D, Kelly D, Sekercioglu, Tamback D F, Whelan C J. 2011 Perspectives in ornithology: the need to quantify ecosystem services provided by birds. Auk 128, 1-14
Whelan, C.J., Wenny, D.G., Marquis, R.J. 2008. Ecosystem services provided by birds. Annals New York Academy of Sciences 1134, 25-60.
Nesting spaces provided by bee-eaters to :
Rock sparrow; House sparrow; Spanish sparrow; Tree sparrow; Sand martin; Little owl; European roller; Pied wagtail; Ethiopian starling; Hoopoe; African pied starling; African hoopoe.
Casas Criville A, Valera F. 2005. The European bee-eater (Merops apiaster) as an ecosystem engineer in arid environments. Journal of Arid Environments 60, 227-238.
Smitha B, Thakar J, Watve M. 1999. Do bee-eaters have a theory of mind? Current Science 76, 574-577
Purger, J.J. 2001. Numbers and breeding distribution of the Bee-eater (Merops apiaster) in province Voivodina (northern Serbia) between 1997 and 1990. Vogelwelt 122, 279-282.
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