Zebra Finches inhabit a wide range of grasslands and forests, usually close to water.They are typically found in open steppes with scattered bushes and trees, but have adapted to human disturbances, taking advantage of human-made watering holes and large patches of deforested land. Zebra Finches — including many human-bred variants to the species — are widely kept by genetic researchers, breeding hobbyists and pet owners.
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The life expectancy of a Zebra Finch is highly variable because of genetic and environmental factors. The Zebra Finch may reach up to five years in its natural environment. If they are kept caged, they normally live for 5 to 7 years; if they are well looked after and happy, they may live up to 12 years,with the exceptional case of 14.5 years reported for a caged specimen.The greatest threats to the survival of the species are predation by cats and loss of natural food.
Data refer : http://en.wikipedia.org/wiki/Zebra_finch