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Divisional Forest officer Akashdeep Wadhawan said the forensic examination revealed the 10-years-old female died of suffocation.
The carcass of 1.97-long Gangetic river dolphin, was recovered from gate number 1 of the barrage by Forest Range Officer Vijay Kumar Mishra and other forest officials on Tuesday, they said Gangetic river dolphins were declared national aquatic species in 2010.