The study of diet variation of the white stork Ciconia ciconia, according to the biological cycle in the region of Tébessa is based on the decortication of the rejected pelots. In 2014, during the nesting period of this wader, rejection pelots under the nests in El-Merdja colony were regularly collected. In the study area, the White Stork consumes different ranges of prey, both invertebrate and vertebrate, where Gasteropods, Arachnids, Aves and insects were included. Its diet was different in number and depended on the different phases of the life cycle. During the pre-breeding period, the food of this bird was based on 3 orders of prey: The Orthoptera represented a peak of 39.67%, followed by the Coleoptera 35.53%, and finally the Dermaptera 24.79%. While during the breeding and rearing period, the total consumption of the Order Coleoptera was almost doubled by a maximum peak of 63.51%, the Orthoptera decreased to 8.11%, and the Dermaptera reached a percentage of 25.56% by showing a stability of consumption between the different periods of the biological cycle, as well as 2 new orders which appeared in a very minimal way: The Hymenoptera 0.71%, and the Neuroptera 2.15%. Maximum richness was observed at the young chick rearing period with 24 species, and the Shannon diversity index applied to prey species was high; This explained the high availability of many preys in the field by the need to feed the chicks, while the equitability index values was 0.76 which showed that the numbers of the consumed preys tended to be in equilibrium with each other.