 Laid out on of land, the Calcutta zoo has been unable to expand or modify its layout for over 50 years, and thus has a rather backdated plan.It contains a "Reptile House" (a new one has been built), a "Primate House", an Elephant House, and a Panther House which opens out onto the open air enclosures for the lions and tigers.It also boasts of a glass-walled enclosure for tigers, the first of its kind in India.