Almost outside of Chennai there is a big zoo. (Don't ask which direction... Rather near to the airport was it, I think.) It is good place for a whole day trip. The walking paths in the zoo are rather long.
In that zoo you can see for example lions (also a small lionsafari), elephants, snakes (We didn't go to see), kangaroos (We didn't see it among the bushes.) and so on...
There is also an other zoo, which is called a snakepark (or something like that).
When you take a taxi to the bogger zoo I would advice to take a real taxi instead of a riksha, because it is rather a long way from the center of Chennai.
Far from the city and one of the greenest parts of Chennai is the Vandalur Zoo. Set a day aside to ensure you, it is also called Arignar Anna Zoological Park. From reptiles to wild cats you get to see it all here- more than 170 species of animals here and one of the largest zoos of India & South Asia, it is also India's first public zoo.
Known as one of the biggest zoological parks in South East Asia, Anna Zoological Park is a house to more than 170 species of mammals, reptiles and birds. Watch around 47 mammal species, 63 bird species, 31 reptile species, 5 amphibian species, 25 fish species and 10 insect species at none other than the Anna Zoological Park in Chennai. Every measure is taken by the veterinary section to take care of the species living in the Anna Zoological Park.
Going on lion safaris, elephant rides and battery-operated vehicles are some of the ways by which you can explore Anna Zoological Park in Chennai. Some of the main attractions of Anna Zoological Park include Nocturnal Animal House, Walk through Aviaries, Butterfly Houses, Zoo School, Reptile Enclosures, Children’s Park, Rest Area, Prehistoric Animal Park, Gardens, Lawns and Insectariums Complex. Don’t forget to visit the Otteri Lake situated within the park that is the roosting ground for a large number of migratory birds like Painted Stork, Herons, White Ibis, Egrets, Billed Stork and so on. So do make sure to visit the Anna Zoological Park, one of the popular Tourist Attractions in Chennai.