How long do pet birds live?

depends on the bird. :S

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small birds (budgies, finches, canaries etc.): 5-15 years

small-medium birds (cockatiels, lineolated parakeets): 1-20 years

medium birds (pionus, conures, Quakers, lories): 25-40 years

medium-large birds (example: African grey, some Amazons): 30-50 years

large birds (large Amazons, large cockatoos, large macaws): 50-80 years