Opossums can be a real nuisance. These critters are nocturnal, so most of their bad behavior takes place at night.   They love a moonlit stroll through your garden, feeding on berries, grapes, nuts, and tree fruits. These scavengers may even visit their favorite romantic dining spots -- your outdoor trash can and the cat food bowl.   After dinner, they will likely take a bathroom break on your lawn, patio, walkways, or flower beds. And in a moment of passion, they may get into fights with your dog or cat and cause serious injury with their ravaging teeth.   These omnivores will occasionally invade your chicken coop and eat eggs or chickens. They can tear insulation, chew on wires, and create or enlarge entry holes in your house, shed, or barn.