All mammals experience difficulty sleeping when it becomes too warm. Because of an insulating layer of fat and an exceptionally thick, dense coat of fur, this temperature is far lower for members of our wildlife community in winter than during summer.
From Thanksgiving through early April, several successive nights with the air hovering around the freezing point is warm enough to cause the raccoon to stir from its prolonged winter slumber and emerge from its den. If the wind is light and there is no precipitation falling, this familiar nocturnal marauder begins to explore the surrounding area for anything edible.
Like the black bear and skunk, the raccoon experiences a type of winter dormancy known as carnivorean lethargy. Throughout the autumn, these creatures ingest large quantities of food in order to develop substantial deposits of fat. As weather conditions deteriorate with the onset of winter, the raccoon settles into a sheltered spot, often in a large chamber of a standing tree several dozen feet above the forest floor. Around the towns and villages of the Park, the raccoon is known to use enclosures inside an unused garage or barn or the attic of a camp or seasonal home.
Unlike a true hibernator, such as the bat, jumping mouse and woodchuck, the raccoon does not experience a substantial drop in its metabolism during this period of inactivity. While its heart rate, level of respiration and body temperature do decline, the amount which they decrease is small when compared to the rates of those mammals that hibernate. Because the brain of the raccoon does not shut down during its form of torpor, it can awaken more easily than a true hibernator should its space be invaded by an intruder or thermal conditions around it warm significantly.
During mild spells, the raccoon takes advantage of any edible items that it happens to detect in the nearby surroundings. The winterkilled remains of creatures unable to tolerate the shortage of food and the harsh weather of the winter season are a prime source of food for this opportunistic scavenger. The keen sense of smell which the raccoon possesses also enables it to locate numerous plant items, like a cluster of tree seeds or beechnuts that would be passed over by other similar size animals that more specifically target small game. With a limited amount of snow on the forest floor, the raccoon can more easily plunder the caches created by mice and voles than during a more typical winter. A raid on the nest of any squirrel that happens to fall within the reach of this skilled climber is also possible as the raccoon prowls for food in late winter.
Along with its quest for food, the raccoon also seeks out the location of other raccoons at this time of year. In the Adirondacks, males usually exit their den by the first week of March, regardless of weather conditions to find breeding partners. Mating several weeks before the equinox causes the young to be born during the first half of May. This is the time when breeding frogs and salamanders become fairly easy prey for this sharp-clawed critter. An influx of such protein enriched food enables the female to nurse her newborn babies with an adequate supply of milk. Later in May there are painted turtle eggs and nesting waterfowl to maintain the developing raccoon family with the nutrients needed for growth.
While some mating might occur prior to the first week of March, most females are not receptive quite yet. This prevents the young from being born too early in spring when a mild February causes these animals to stir from their sleep.
Photo of Racoon courtesy Wikimedia user Darkone.
A version of this story first appeared in the Adirondack Almanack in 2012.
Another interesting article that goes well beyond what is commonly known about otherwise common wild creatures. Thanks Tom.
Real nice write-up – like what I learned here, thanks!
Our chicken coop was, unfortunately, on the receiving end of a sleepless raccoon recently. Our error as we let our girls out on a mild winter day to give them a break in their fenced in run from their winter coop digs and forgot to shut the door when they went back in to roost. We woke to a slaughter of four. Can only be mad at ourselves and not the opportunistic raccoon. Lesson learned, don’t forget to close up the coop. Thanks for the great in-depth article on this masked marauder.
[…] hairy guy, of course. For a raccoon, even temperatures that hover over the freezing point can be warm enough to wake raccoons from their wintertime […]