system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Crows are all over the world, but where are crows naturally from and what kind of effect did they have as an invasive species?
gpt
There are a lot of related species of dark-black colored corvids that we collectively call “crows”.  The North American Crow, the European Carrion Crow, and the Australian Crow all look similar but are not the same species.

You’ll have to see what species are in your area and if they’re all native.  They’re a smart, adaptable group so they can worm their way into other habitats, but most of the world has existing species that already fill that slot.