The shots, running $2 to $10, have no side effects such as swelling,

Do they have contraceptive methods that do induce swelling?

"What are you doing today at work, honey?"
"I'm giving a bunch of squirrels a birth control shot."

Those little *tree rats* are genuine pests. They chewed a huge hole in a beautiful screened-in porch to reach the bird seed! I know it's impractical in a city but the old fashioned way worked fine...a b-b doesn't cost much at all and allows for great target practice.