A Delhi-based wildlife body said that the blue bull was rescued from a park in Alaknanda in South Delhi and was released into the adjoining forest area after a brief observation period.
"The Nilgai was found wandering near the wall that separates the 'green belt' region from the residential enclave. The rescue operation took almost four hours as the animal was stressed and care had to be taken not to injure it.
Blue bull (Boselaphus tragocamelus) is the largest Asian antelope and is endemic to the Indian subcontinent and it is protected under Schedule III of the Wildlife Protection Act, 1972.
The blue bull was presumed to have strayed into the residential area from the adjoining Jahanpanah Forests.
"Nilgais straying into residential areas is not uncommon these days. In case of coming across a stray Nilgai, we request the people not to chase or tease the animal.