HamsterJam
Let’s take it apart to see what’s inside….
I think it depends how they get here - if they make it under their own steam, they can be defined as native (Collared Doves in 1956 for example) whereas if they were introduced my man, they're not considered native.
A native species is one that occurs naturally in a given area or habitat, opposed to an artificially introduced species.
Greys were brought to the UK by humans so will always be an introduced species.