Opossums are a marsupial, nocturnal animal. Opossums eat mostly meats, but will eat plants, fruits, garbage, bird seed, eggs, moles and pet food. Opossums are solitary animals and will spend many days in a den during cold spells. Opossums have a home range of 10-50 acres and are found in many attics, garages and barns. Opossums breed in February – June with and average littler size of 6-16.