A private zoo run by the son of Asia's richest man is being investigated over allegations of animal mistreatment and illegal wildlife imports.

Home to a reported 200 lions, 250 leopards, and 900 crocodiles, Vantara in western Gujarat, state calls itself the 'world's biggest wild animal rescue centre'.

Located on on the site of a former oil refinery and led by billionaire Mukesh Ambani's son, Anant Ambani, it has rescued and treated thousands of animals.

Vantara was also one of the venues for Anant's pre-wedding celebrations last year, with the global celebrities who attended advised to don 'jungle fever' outfits when visiting Vantara.

India's Supreme Court on Monday ordered an inquiry into petitions from NGOs and wildlife groups alleging animal mistreatment at Vantara and questioning how the animals were placed there.