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♦ 1Krebs, J. R., & Avery, M. I. (1985).
Central place foraging in the European bee-eater, Merops apiaster. The Journal of Animal Ecology, 459-472.
♦ 2Feeding habits of the European pond terrapin Emys orbicularis in Camargue (Rhône delta, Southern France), Dario Ottonello, Sebastiano Salvidio, Elisabeth Rosecchi, Amphibia-Reptilia 26 (2005): 562-565