This study was conducted during the breeding period of the Lesser kestrel Falco naumanni during the 2016 & 2017 years, in the southwestern part of the city of Constantine (36°20'09,10'' N, 6°34'41,51'' E). Its principal aim was developing a monitoring technic, to collect data on the biology and ecology of the species during the breeding season, and determine the exploited habitats by the lesser kestrel during the nestling season. For that, binoculars were used to observe the parents’ behavior outside the nest. On the other hand, the video surveillance method was opted to monitor the parent’s activities during the nestling period. In addition to the parameters directly related to the reproductive monitoring, such as nest location, nesting size, number of breeding pairs, reproductive success and productivity, this study allowed us to identify and monitor over 1650 preys in the three nests.