Investigating officer Achilles Pratap Singh told CNN that the dolphin’s body was found on the embankment of the Sharda Canal in the Pratapgarh district on December 31.
Three people allegedly arrested in the video were arrested on Thursday, police said. Nine people – also seen in the video – are still on the run, according to Singh.
The video shows a group of men with sticks and an ax killing a dolphin to death. Some laughed as the dolphin’s almost lifeless body was pulled by its fin into the shallow water.
Forest official Varun Singh, who was part of the initial investigation, told CNN that the dolphin was an adult dolphin from the Ganges River.
The Ganges dolphin was “once present in tens of thousands,”
The rare freshwater dolphin is essentially blind and is known locally as “susu,” a reference to the noise it makes when it breathes, according to the WWF.
When hunting, the dolphin emits ultrasonic sounds that bounce off fish and other prey, allowing them to visualize an image in their mind.
Ganges dolphins give birth to only one calf every two to three years, according to the WWF.