The Trash Panda

The raccoon (/rəˈkuːn/ or US: /ræˈkuːn/, Procyon lotor), also spelled racoon[3] and sometimes called the common raccoon or northern raccoon to distinguish it from the other species, is a mammal native to North America. It is the largest of the procyonid family, having a body length of 40 to 70 cm (16 to 28 in), and a body weight of 5 to 26 kg (11 to 57 lb). Its grayish coat mostly consists of dense underfur, which insulates it against cold weather. The animal's most distinctive features include its extremely dexterous front paws, its facial mask, and its ringed tail, which are common themes in the mythologies of the Indigenous peoples of the Americas surrounding the species. The raccoon is noted for its intelligence, and studies show that it is able to remember the solution to tasks for at least three years. It is usually nocturnal and omnivorous, eating about 40% invertebrates, 33% plants, and 27% vertebrates.

Rhododendrites, CC BY-SA 4.0

In Europe, the raccoon has been included on the list of Invasive Alien Species of Union Concern since 2016. This implies that this species cannot be imported, bred, transported, commercialized, or intentionally released into the environment in the whole of the European Union.
Though previously thought to be generally solitary, there is now evidence that raccoons engage in sex-specific social behavior. Related females often share a common area, while unrelated males live together in groups of up to four raccoons in order to maintain their positions against foreign males during the mating season and against other potential invaders. Home range sizes vary anywhere from 3 ha (7.4 acres) for females in cities, to 5,000 ha (12,000 acres) for males in prairies. After a gestation period of about 65 days, two to five young known as "kits" are born in spring. The kits are subsequently raised by their mother until dispersal in late fall. Although captive raccoons have been known to live over 20 years, their life expectancy in the wild is only 1.8 to 3.1 years. In many areas, hunting and vehicular injury are the two most common causes of death.

Physical Characteristics

Head to hindquarters, raccoons measure between 40 and 70 cm (16 and 28 in), not including the bushy tail which can measure between 20 and 40 cm (7.9 and 15.7 in), but is usually not much longer than 25 cm (9.8 in). The shoulder height is between 23 and 30 cm (9.1 and 11.8 in). The body weight of an adult raccoon varies considerably with habitat, making the raccoon one of the most variably sized mammals. It can range from 2 to 26 kg (4.4 to 57.3 lb), but is usually between 5 and 12 kg (11 and 26 lb). The smallest specimens live in southern Florida, while those near the northern limits of the raccoon's range tend to be the largest (see Bergmann's rule). Males are usually 15 to 20% heavier than females. At the beginning of winter, a raccoon can weigh twice as much as in spring because of fat storage. The largest recorded wild raccoon weighed 28.4 kg (63 lb) and measured 140 cm (55 in) in total length, by far the largest size recorded for a procyonid. The most characteristic physical feature of the raccoon is the area of black fur around the eyes, which contrasts sharply with the surrounding white face coloring. This is reminiscent of a "bandit's mask" and has thus enhanced the animal's reputation for mischief. The slightly rounded ears are also bordered by white fur. Raccoons are assumed to recognize the facial expression and posture of other members of their species more quickly because of the conspicuous facial coloration and the alternating light and dark rings on the tail.The dark mask may also reduce glare and thus enhance night vision. On other parts of the body, the long and stiff guard hairs, which shed moisture, are usually colored in shades of gray and, to a lesser extent, brown.

David Menke

The raccoon, whose method of locomotion is usually considered to be plantigrade, can stand on its hind legs to examine objects with its front paws. As raccoons have short legs compared to their compact torso, they are usually not able either to run quickly or jump great distances. Their top speed over short distances is 16 to 24 km/h (9.9 to 14.9 mph). Raccoons can swim with an average speed of about 5 km/h (3.1 mph) and can stay in the water for several hours. For climbing down a tree headfirst—an unusual ability for a mammal of its size—a raccoon rotates its hind feet so they are pointing backwards. Raccoons have a dual cooling system to regulate their temperature; that is, they are able to both sweat and pant for heat dissipation.
Raccoon skulls have a short and wide facial region and a voluminous braincase. The facial length of the skull is less than the cranial, and their nasal bones are short and quite broad. The auditory bullae are inflated in form, and the sagittal crest is weakly developed. The dentition—40 teeth with the dental formula is adapted to their omnivorous diet: the carnassials are not as sharp and pointed as those of a full-time carnivore, but the molars are not as wide as those of a herbivore. The penis bone of males is about 10 cm (3.9 in) long and strongly bent at the front end, and its shape can be used to distinguish juvenile males from mature males. Seven of the thirteen identified vocal calls are used in communication between the mother and her kits, one of these being the birdlike twittering of newborns.

Intelligence

Quartl, CC BY-SA 3.0

Zoologist Clinton Hart Merriam described raccoons as "clever beasts", and that "in certain directions their cunning surpasses that of the fox". The animal's intelligence gave rise to the epithet "sly coon". Only a few studies have been undertaken to determine the mental abilities of raccoons, most of them based on the animal's sense of touch. In a study by the ethologist H. B. Davis in, raccoons were able to open complex locks in fewer than tries and had no problems repeating the action when the locks were rearranged or turned upside down. Davis concluded that they understood the abstract principles of the locking mechanisms and their learning speed was equivalent to that of rhesus macaques. Studies in concentrated on raccoon memory showed that they can remember the solutions to tasks for at least three years. In a study by B. Pohl in, raccoons were able to instantly differentiate between identical and different symbols three years after the short initial learning phase. Stanislas Dehaene reports in his book The Number Sense that raccoons can distinguish boxes containing two or four grapes from those containing three. In research by Suzana Herculano-Houzel and other neuroscientists, raccoons have been found to be comparable to primates in density of neurons in the cerebral cortex, which they have proposed to be a neuroanatomical indicator of intelligence.

Senses

The most important sense for the raccoon is its sense of touch. The "hyper sensitive" front paws are protected by a thin horny layer that becomes pliable when wet. The five digits of the paws have no webbing between them, which is unusual for a carnivoran. Almost two-thirds of the area responsible for sensory perception in the raccoon's cerebral cortex is specialized for the interpretation of tactile impulses, more than in any other studied animal. They are able to identify objects before touching them with vibrissae located above their sharp, nonretractable claws. The raccoon's paws lack an opposable thumb; thus, it does not have the agility of the hands of primates. There is no observed negative effect on tactile perception when a raccoon stands in water below 10 °C (50 °F) for hours. Raccoons are thought to be color blind or at least poorly able to distinguish color, though their eyes are well-adapted for sensing green light. Although their accommodation of dioptre is comparable to that of humans and they see well in twilight because of the tapetum lucidum behind the retina, visual perception is of subordinate importance to raccoons because of their poor long-distance vision. In addition to being useful for orientation in the dark, their sense of smell is important for intraspecific communication. Glandular secretions (usually from their anal glands), urine and feces are used for marking. With their broad auditory range, they can perceive tones up to kHz as well as quiet noises, like those produced by earthworms underground.

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