Perodicticus potto
potto

The range of Perodicticus potto stretches across equatorial Africa in tropical rainforests from Gambia and Senegal to western Kenya. (Butynski, T., and Members of the Primate Specialist Group 2000, 2007; Kingdon, 1997)

Pottos are found in areas of thick rainforest vegetation. They can live in a variety of habitats from coastal and lowland forest to mid-altitude montane forest and can inhabit primary or secondary forest growth. They occupy forest from sea level to 2089 m elevation. Normally pottos are found in trees that are 5 to 30 m tall. ("Potto", 1999; Kingdon, 1997; Nekaris and Bearder, 2007; Ravosa, 2007)

Pottos are sexually monomorphic. Pottos have long, slender bodies and limbs with forelimbs and hindlimbs of nearly equal length. They have large eyes and small, round ears that lack fur. Their coat is dense and varies from shades of brown to grey. They also possess features found in other living strepsirrhines such as a moist nose, dental comb, and a toilet claw. With the exception of the sharpened toilet claw on the reduced second digit of the hind feet, all other nails are flattened. The index finger is vestigial. The reduced second digits on the hands and feet and the opposable pollex and hallux create an excellent grip on arboreal supports. Other adaptations for prolonged grip include highly flexible wrist and ankle joints and the presence of vascular bundles in the limb vessels that allow blood circulation to contracted muscles while the animal is immobile (retia mirabilia). Pottos also possess a “scapular shield” consisting of elongated spines of the cervical vertebrae that extend above the contour of the animal’s body. The spines are covered by thick skin and fur. Patches of vibrissae are also dispersed in this area of the fur. The “scapular shield” area is believed to function in defense against predators and other pottos, and possibly to stimulate genital secretions in mates. Adult weights range from 600 to 1600 g, with smaller pottos occupying the warmer, low elevation habitats and larger pottos occupying the cooler, high elevation habitats within their range (Bergmann’s rule). Head and body measurements range from 305 to 390 mm with a tail length of 37 to 100 mm. Throughout their range, pottos vary regionally in body mass, body size, pelage, and color of eyeshine. ("Lorises, Pottos,, and Galagos", 1999; "Potto", 1999; Bearder et al., 2003; Kappeler, 1995; Kingdon, 1997; Nekaris and Bearder, 2007; Pimley, Bearder, and Dixson, 2005; Ravosa, 2007)

Information on the lifespan of pottos in the wild is lacking, but captive individuals have been recorded to live up to 26 years of age. ("Potto", 1999; Nekaris and Bearder, 2007)

Pottos are primarily solitary and nocturnal animals, except for females with their young. ("Lorises, Pottos,, and Galagos", 1999; "Potto", 1999)

Home Range

Males and females defend home ranges large enough to provide ample foraging opportunities. Female home ranges must be large enough to support the female and her young, they are generally 6 to 9 hectares in size. Males defend larger home ranges in order to overlap with those of several females, from 9 to 40 hectares. Both males and females aggressively defend their territories against same sex conspecifics. Population densities have been estimated at 8 to 10 pottos per square kilometer. ("Lorises, Pottos,, and Galagos", 1999; "Potto", 1999)

Pottos use chemical cues extensively to communicate. They leave urine trails and secretions from glands under the tail on branches to mark territory and communicate information on their reproductive state. They use a toxic or noxious glandular secretion to deter predators. Pottos have a distinct odor that some observers have called "curry-like." They have several vocalizations, the most common being a female contact call to young that sounds like "psic." Pottos have excellent vision in low light in order to navigate and find food at night. ("Lorises, Pottos,, and Galagos", 1999; "Potto", 1999)

Pottos are primarily frugivorous, but they also commonly eat animal prey and plant gums. Because there is seasonal variation in food availability, gums are generally consumed in dry seasons, while animal prey and fruits are more readily available during wet seasons. Pottos eat fruits of the genera Ficus, Musanga, Myrianthus, Parinari, Pseudospondias, and Uapaca. They generally eat slow-moving arthropods or insects that other animals find unpalatable such as ants, foul-smelling beetles, caterpillars with irritant spines, poisonous millipedes, and spiders. They also eat snails, slugs, eggs, fungi, and insect larvae. Occasionally they will kill small vertebrate prey, such as bats or birds. Although pottos compete with many other species in the same niche for food (such as bush babies), they have adapted to eating foods that other animals leave behind such as unpalatable insects. They also have developed comparatively strong jaws for their size to eat larger, tougher fruits and large, stale chunks of plant gum. Pottos locate insects by scent and capture them with a rapid grab with their hands or mouths. Their reduced index fingers help them grasp and capture prey. Pottos have a highly expandable stomach, allowing them to eat large quantities of food and hold up to 8 percent of their body weight. This reduces the chance of predation by allowing them to eat quickly in fruiting trees with sparse vegetation, then retreat to trees with dense foliage to digest and rest. ("Potto", 1999; Estes, 1991; Kingdon, 1997; Nekaris and Bearder, 2007; Pimley, Bearder, and Dixson, 2005)

The main anti-predator strategy for pottos is crypsis. Cryptic behavior in pottos includes nocturnal activity, small body size, cryptic coloration, using little vocal communication, maintaining small group sizes, possessing the ability to remain immobile for extended periods of time without fatigue (using retia mirabilia), and using slow, steady, and silent locomotion. They usually stay hidden in dense vegetation so as to not be detected by predators. If confronted by a predator, they will exhibit their defense posture which consists of grasping a branch with all four limbs, tucking the head down below their shoulders between the forelimbs, arching the back, and presenting the scapular shield. They will then bare the teeth and repeatedly bite the arboreal support they are grasping. If the predator does not retreat, the potto will then charge forward, trying to knock the predator off the branch. In extreme danger, the animal will let go of its branch and fall to the ground. Perodictus potto is one of the few nocturnal prosimians that do not use leaping to escape from predators. When parked infants are left alone by their mothers, the mother will apply a salivary liquid to her offspring by grooming it with her tooth comb. This liquid applied to the infant repels predators, and it is thought that it may possess some kind of toxin. This toxic or noxious secretion may also be used to protect adults from predation. Known predators of pottos are African palm civets (Nandinia binotata), although these civets are primarily frugivorous. (Alterman, 1995; Crompton and Sellers, 2007; Estes, 1991; Nekaris, Pimley, and Ablard, 2007)

As frugivores, pottos are instrumental in seed dispersal. They are also a source of prey for their predators.

There are no known adverse effects P. potto on humans.

Pottos are hunted for their meat by humans, and are occasionally taken for the pet trade. Humans also benefit from seed dispersal by pottos. (Nekaris and Bearder, 2007)

The main threats to potto survival in the wild are predation, deforestation, and human hunting. The IUCN Red List of Threatened Species considers pottos “Lower Risk/Least Concern” and they are listed under CITES Appendices II and III. However, there are few studies that have effectively documented potto population size. Pottos (and other nocturnal prosimians) are impacted more severely than other arboreal primates by deforestation and human development because forests are usually cleared during the day while pottos are asleep in the trees. Due to their slow locomotion and their tendency to freeze when threatened, they are easily burned or chopped down with the trees. (Butynski, T., and Members of the Primate Specialist Group 2000, 2007; Nekaris and Bearder, 2007; UNEP - WCMC, 2008)