The recent expansion of an avian invasive species (the Cattle Egret Ardea ibis) in Algeria

► In Algeria, the Cattle Egret expanded its range 560 km to the south in 40 years. ► Few hundred pairs were observed in the 70s; 87 colonies hosted 30 000 pairs in 2007. ► Agriculture fostered this expansion and the numerical increase in breeding numbers. ► The clutch size and realization of two broods per year also played a role.