India, Oct. 26 -- A male black swan housed in the bird enclosure at Nandankanan Zoological Park (NZP) in the Odisha capital here died on Monday.

During the post-mortem examination, veterinarians detected an infection in the bird's intestinal tract. However, the exact cause of death is yet to be established.

To determine the precise cause, samples collected from the carcass have been sent to the Odisha University of Agriculture and Technology (OUAT) for further examination.

Following the death, Nandankanan Zoological Park is now left with three black swans - two females and one male.

It is worth mentioning here that NZP has altogether 4,000 animals and birds of around 160 species. The zoo has 48 species of mammals, 77 species of birds...