Ferrets do not multiply like vermin. They make love.
https://www.fws.gov/mountain-prairie/es/blackFootedFerret.php
Hmm pretty sure I don't want to click on a link about ferrets after you said "they make love" Don't need ferret porn in my browser history.
No, it's vermin since if they don't, the female can die.
It's my responsibility, but they multiply like vermin.