We used to have flocks of American Goldfinches during the summer. They would perch in the Navajo Willows in our front yard. Hundreds of them. It looked like a Christmas tree with bird ornaments. Then the cats started showing up. The flocks disappeared. The cats destroyed the nests as well as killing the breeding pairs. I used to find dozens of nests and broken eggs on the ground. I saw cats carrying Goldfinches in their mouths. The birds disappeared. Last summer we had 2 pair take up residence in our yard again. It has been over a decade since we had them in our yard. Two days ago I saw a feral cat carrying a dead one in its mouth. It made me sick. I love animals but I don't love animals that don't belong here. Native species don't have a chance against the claws, speed, teeth, leaping abilities of cats.