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The Indian Flying Fox (Pteropus giganteus) is a species of flying fox of the Pteropodidae family under
the suborder Megachiroptera. It is one of the largest fruit bat species found in the Indian subcontinent.
They have one to two young. This bat is gregarious and roosts in colonies which can number up to 1,000
individuals, during the day. Due to various anthropogenic and environmental causes their populations
are declining alarmingly. Current study has been aimed to know the population and its fluctuation in the
“Kacharighat Roosting Site” of Dhubri town area of Assam. “Direct roost count” method was
followed to estimate the population size of the colony. Observations were mostly done with the naked eyes. All
total four roosting spots were identified in the roosting site. Highest population was recorded at 775 in
the site. Total population of the roosting site was ranged between 720 and 775 during the study. Average
population of the site was recorded at 735 no. of bats. Spot wise fluctuations were very minimal and the
population at the Kacharighat Roosting site was more or less stable during pre-monsoon.
Key words: Indian flying fox, Pteropus giganteus, population, Fluctuation, Assam.