This is a short article about the very first mapping of bird species that have colonized countries where they are not originally found (like the quakers, cherryheads, IRNs, etc). And, what I found super interesting is that although the whole thing of people bringing birds to other countries started in the 1500's, there have been more from 1983 to 2000 than in the 400 plus years before! Why? Pet bird trade!
https://www.sciencedaily.com/releases/2 ... 141150.htm