Here is a quote from the article linked above:
The proposal, which was raised five years ago and voted down by the Conservation Congress, was revived after a 2004 University of Wisconsin study that found non-native feral cats were a threat to native animals such as lovebirds.
There is not a bird called a lovebird native to Wisconsin. Lovebirds are Parrots native to Africa. But cats would kill them if they could.