Savas Kazantzidis, Vassilis Goutner, Myrto Pyrovetsi, Apostolos Sinis, Comparative Nest Site Selection and Breeding Success in 2 Sympatric Ardeids, Black-Crowned Night-Heron (Nycticorax nycticorax) and Little Egret (Egretta garzetta) in the Axios Delta, Macedonia, Greece, Colonial Waterbirds, Vol. 20, No. 3 (1997), pp. 505-517
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Kazantzidis et al. (1997) studied this question.