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In this paper, the authors have studied about the effect of COVID-19 on the population of birds. For this survey the authors selected a premises (small land area) where they found birds in plenty and they started to keep watching on their numbers since January 2020 onwards. The authors have applied the method of least squares to find the trend line series and try to reach a conclusion when the position of their numbers will become similar as Jan.2020. The authors have also described the fall and rise (or changes) the number of birds counting by line graph. An index number between time and number of birds are also given in the last.
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