Byculla zoo's most exotic occupants have been raking in the moolah ever since they arrived in March 2017. The BMC has so far earned around Rs 11 crore, with the last weekend alone generating Rs 10 lakh from the penguin enclosure's entry fees.

The penguins, which cost the corporation Rs 45 crore, right from buying them, setting up their enclosure and maintenance for five years, have ensured recovery of almost 25 per cent of it in two years alone. The BMC is now gearing up to throw open the 3D theatre, too, at the zoo.