They should be considered a nuisance species with no declared season or bag limit.
Kinda like coyotes/bobcats/mountain lions in Texas:
Nongame Species
A hunting license is required for the take of nongame species. There are no closed seasons, bag limits or possession limits; and, they may be hunted at any time by any lawful means or methods on private property. There may be restrictions for certain species of nongame animals, including possession limits (see below). In addition, be aware that public hunting lands may also have additional restrictions. 
