There are a lot of stray cats that wander around this town. Actually, I can't really be sure if most of them are technically estuary or if they're feral. (Which would mean they were born in the "wild" even though they're descended from other domesticated animals.)
Actually, it's a bit odd when you think about it that a "feral child" can exist in humans, since that technically means that it isn't "domesticated", meaning that it hasn't been genetically conditioned by humans to better benefit humans. So when you really break it down, by social conditioning we've tamed each other into domesticated animals, not individually but as a group organism.
So would that make someone who's disconnected from most social cliques to be a stray? Doesn't sound that unreasonable.