Raccoons - November 20, 2002
Jeff Schalau, County Director, Agent, Agriculture & Natural Resources
Arizona Cooperative Extension, Yavapai County
Raccoons are common in the central Arizona highlands. The river, streams, and ditches of the Verde Valley make this an extremely attractive habitat. Raccoons will make dens in attics, chimneys, under houses, in abandoned structures, and woodpiles. Their opportunistic nature draws them to urban environments. Once there, they can cause extensive damage to structures, crops, and landscapes. They can also harbor and transmit various diseases to other animals and humans.
Adult raccoons may weigh from 10 to 30 pounds, are 2 to 3 feet in length, and are about 16 inches tall at the shoulder. Adult males occupy territories of 3 to 20 square miles, compared to 1 to 6 square miles for females. Raccoons do not hibernate but may sleep several days to a couple of weeks during extremely cold weather. They are nocturnal and solitary except when breeding or caring for their young.
Breeding usually occurs between January and March, with females mating once a year. After a gestation period of 63 days, an average litter of 3 to 5 young are born. The young weigh about 2 ounces at birth, open their eyes at about 3 weeks, and are weaned from 2 to 4 months of age. Some young may disperse in late autumn, but all are driven away before the next litter is born. Raccoons will attack if cornered, especially if young are present. They typically are not long-lived in the wild. Fifty to seventy percent of all populations consist of populations under one year old.
Raccoons are omnivorous and will eat plants or animals, depending on what is available. Plant foods include fruit, vegetables (especially sweet corn) or nuts. Animal foods may include grubs, crickets, grasshoppers, crayfish, clams, frogs, worms, fish, turtles, bird eggs and nestlings, squirrels, rats, or mice. In urban environments, they will also eat dog or cat food, or garbage. They will also kill chickens and other domestic fowl taking bites here and there, rarely consuming all they kill. Raccoon tracks are very distinctive with the front feet looking like small human handprints.
Raccoons carry several diseases that are transmissible to humans and domestic animals. Among these are rabies, distemper, mange, and canine and feline parvovirus. Raccoon feces may also contain roundworm eggs. Humans, especially children, that come into contact with feces that contain eggs can become infected. Clinical symptoms vary with the number of roundworm larvae present in the body and their location. If the larvae migrate to the eyes or brain, blindness or death may result.
The best damage control strategies for raccoons are habitat modification and exclusion. Remove any food or water source, feed pets indoors, and secure garbage containers to prevent access. Restrict access to your roof by pruning trees away from eves and otherwise limiting access to the roof. Cover chimneys with hardware cloth or a metal cover when not in use. Keep poultry enclosed in a secure building at night. Raccoons can climb almost any fence, but the addition of an electric wire strand (using a UL fence charger) at the top of the fence will likely discourage them. Electric fences alone can also be used with two strands: one at 6 inches and another at 12 inches above the ground. Raccoons will also dig under fences, so bury woven wire two feet below the soil surface.
Raccoons are protected under state law in Arizona. You must contact the Arizona Game and Fish Department (AGFD) before attempting to trap or kill one. If you decide to live trap one, you still should inform the AGFD prior to setting the trap. They will provide you with and appropriate release site. Again, the best way to deal with raccoons is to remove the attractants and/or exclude them from areas where they can do damage.
The University of Arizona Cooperative Extension has publications and information on gardening and pest control. If you have other gardening questions, call the Master Gardener line in the Cottonwood office at 646-9113 or E-mail us at firstname.lastname@example.org and be sure to include your address and phone number. Find past Backyard Gardener columns or submit column ideas at the Backyard Gardener web site: http://ag.arizona.edu/yavapai/anr/hort/byg/.
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Last Updated: November 14, 2002
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