The Wisconsin Journal-Sentinel is reporting that the state's Natural Resources Board has decided to employ an experimental adoption program in their efforts to control invasive mute swans (Cygnus olor). Residents that are interested in sponsoring a swan must be willing to pay to neuter and band the bird. The move comes in response to the staunch opposition to current mute swan control programs, which include culling and addling eggs to prevent them from hatching.
I am not aware of the details of the program, but I wonder if it will be possible for enough of the swans to get "adopted" such that reproduction virtually ceases. As soon as I can locate more information (including the cost of adoption), I'll post it here. In the meantime, if there's a Wisconsin mute swan you've had your eye on, be sure to register with the state by June 1st 2007.
Update: bootstrap analysis has weighed in on the mute swan adoption plan, definitely worth a read.