Our study is based on the diurnal time budget and the counting of the great crested grebes (Podiceps cristatus) and the little grebe (Tachybaptus ruficullis) during 24 months (from September 2013 to March 2014 and from September 2015 to March 2016). We have followed-up the diurnal behavior of the two species from the seasonal evolution of their time budget, using a telescope (60×20) and a pair of binoculars (10x50). The absolute method was used because the number of the birds did not exceed 200 individuals. We have used the SCAN method for the study of the diurnal time budget. Our results show that this natural lake plays an essential role in the wintering of the two species and other birds. The study of the diurnal behavior shows that feeding is the most important activity with a value of 51.12% for the great crested grebe and 51.25% for the little grebe over the year 2013-2014. While in 2015-2016 a value of 48% for the little grebe and 51.99% for the great crested grebe followed by swimming, whereas the other activities occupy only one small percentage in the assessment of the diurnal activities of the two species.
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