These mammal moms are made for mobility. Opossums are the only marsupials in North America. Females have fur-lined front pouches to raise their large broods which are born blind and hairless, weighing less than a dime. Despite their scruffy looks, these scavengers are natural cleaners, gobbling up thousands of ticks and eating cockroaches, rats, mice, and more. Check them out in this week's Discover Nature Note.