Opossums are among the most primitive mammals. Fossil ancestry goes back 70 Million years. They have survived by adapting to human habitat and being able to eat just about anything. They are beneficial in that they help to keep the balance of nature.
Opossums are often mistaken for rats. They are not rodents, they are marsupials. They are not aggressive toward humans or pets but they will attempt to defend themselves if cornered. They are relatively disease free. They do not carry Parvovirus, distemper or rabies. They are actually an excellent animal to have around your property because they eat rats, mice, snails, slugs and insects. They also eat over-ripe fruit that has fallen to the ground. They are called "omnivores" because they meat as well as vegetables and fruit.
Opossums are nest builders. They are also nocturnal. They spend much of the day in their dens. At night, they forage for food. They are excellent climbers using all their hands, feet and tail to grasp.