Domestic birds in the wild?

I had a budgie that got out of it's cage, and then it was torn apart pretty much straight away by other birds.

where would domestic birds come from? Budgies and Finches, and all the cute little birds that you can't imagine living outside, is there anywhere in the wild they'd survive?

they'd have to have come from somewhere
Answers:
Budgerigars come in a variety of colors now because they have been selectively breed to bring out color mutations, in Australia where the budgerigar is a native bird, the wild budgie is all green so it blends in well with the enviroment, the wild bird does not come in any other color, so colorful pet birds are at a disadvantage straight away because they vary greatly colorwise from their wild state and are easily spotted by other birds.

I have seen huge swarms of budgies flying in close formation to escape Hawk's, there would have been thousands of birds in the flocks I saw.

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Sure they come from somewhere. But not here. In your case, budgies come from Australia, where they live in large flocks that work together like a school of fish, to camoflauge each other and confuse predators. One budie alone, especially in an environment that doesn't have such brightly colored birds, sticks out like a sore thumb. It's like a bright neon sign pointing to predators: LUNCH. Out in the Australian outback, the landscape is lighter, they blend in better, and they have flocks numbering in the hundreds of similar colored birds to hide in.

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The Central and South American jungles.

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"Parakeets live in many diverse habitats and are found throughout Australia, Asia, tropical and subtropic regions of Africa, Central and South America." (from tweeter.com)

Sorry to hear about your budgie... one of my budgies flew away, too.

Birds that humans own as pets actually ARE types of wild birds. But unless you got it straight from the wild, it was bred specifically to be a pet.

The only place I can think of in the U.S. where a parakeet might survive would be Florida - where there are other tropical birds. Anywhere else, a parakeet would not survive very long because of the climate and because of predators. The colors of a parakeet make it stick out like a sore thumb in most places - making it more visible to predators.

You could Yahoo or Google any species of bird you wanted to find out where they were/are originally from.

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The wild budgie is a green coloured bird which basically is hard to detect from the air. Being wild, these birds would also know how to avoid predators. Moving around in large flocks also means they reduce their chances of being caught by a predator.
Some other pet birds come from countries where large predatory birds may not exist or are easier to hide from. A pet bird would hardly know where to get food from much less avoid predators so they rarely make it out in the wild.
You did not mention what these 'other' birds are. If you like in a city, I'd be tempted to imagine they are crows or some other city dwelling scavenger. Never seen one of them kill any bird although I've seen them raid nests.