Well you learn something new everyday. I didn't know that the sparrows and house finches were invasive. I just thought they were common. I came across this article today.
https://feederwatch.org/blog/when-i...2I84nMEWjDlekcwyaR4C0g0#.XpJhR8SA4U0.facebook
https://feederwatch.org/blog/when-i...2I84nMEWjDlekcwyaR4C0g0#.XpJhR8SA4U0.facebook