I need a Spanish word or phrase to explain wild monk parakeets. The important part is wild or feral -- that is, they are not escaped pets. Well, they once were, but they aren't now.

The flock of monks I watch has moved into a new area -- and if possible, I want to promote good and sympathetic feelings toward them (as if they aren't skilled at doing that themselves).

I'm accustomed to conversations where there are only a few words of common language; I just don't know how to get across the "feral" aspect. My Spanish-speaking friends aren't nature lovers.

Any Spanish speakers around?