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We  studied  a  colony  of  the  Western  Cattle  Egret  Bubulcus  ibis  located  in  the public garden on the northern outskirts of Chlef, north-western of Algeria, a site with 13 tree  species;  in  this  locality  Cattle  Egrets  nested  only  on  Ficus  elastica,  Jacaranda mimosifolia  and  Pinus  halepensis.  We  observed  the  birds,  each  two  weeks  during  the wintering period and weekly during the breeding season (February to August).  To count the  colony  population,  we  used  the  method  described  by  Dragonetti  &amp;  Giovacchini (2009), called perimeter counts. Egg and nestling were recorded on 20 randomly selected nests and from different locations in each ofthe three nesting trees until all fledging. The number of Cattle Egrets at this site varied according to season, and was higher during the   breeding   season   (1902   individuals)   than   during   the   wintering   period   (1210 individuals). Depending on the morphology of the trees hosting this colony, numbers of these birds varied from one tree to another. The nests observed are placed at relatively low heights, contrary to what has been described by some authors. Reproductive success is  affected  by  the  environmental  conditions  of  the  area  and  also  by  the  physical  and perhaps biochemical characteristics of the nest trees, but no difference in the location or orientation of the nests was noticed.

Ecological and Biological Behaviorof Nesting Colony of Bubulcus ibisin North-Western Algeria