Tigers primarily hunt deer, but as opportunistic predators, they can also eat wild boars, birds, fish, rodents, amphibians, reptiles, and even insects. A large deer can provide a tiger with one week's food, but only one out of every ten hunts is successful. Tigers don't usually eat their prey at the kill site - but instead drag their prey into cover to feed. If a tiger leaves - say to get a drink - it will cover its kill by raking leaves, dirt, grass and even rocks over the carcass.

Source: WWF