Maybe we should try this on our urban yutes?
“The procedure on one bird can stop between six to 12 females from reproducing.”
They must be assuming a lot of the male birds are not getting any action. If that is the case, the plan will only work if they give vasectomies to the male birds getting all the action. If all the male birds are in on the action, what good will it do if you only sterilize part of them?