A cow elephant, aged around 32, was found dead at Sri Chakra Coffee Estate in Singara Range on Saturday.
The elephant did not have any external injuries, according to Forest Department officials.
According to the instructions of the DFO (Nilgiris North Division) S. Kalanithi, veterinarian from Panthalur G. Mangammal conducted the post-mortem examination. Samples were collected for lab analysis.
The cause of death will be known after lab reports, the officials said.
The post-mortem examination was conducted in the presence of forest department officials and representatives of NGOs.