Negative vigilance of visitor behaviors have been identified as starting, posturing and charging at visitors. In captive gorillas, such frequent aberrant behaviors include eating disorders-such as regurgitation, reingestion and coprophagy-self-injurious or conspecific aggression, pacing, rocking, sucking of fingers or lip smacking, and overgrooming. It is common for non-human primates kept in captivity to exhibit behaviors deviating from the normal behavior observed of them in the wilderness. Stereotypic behaviors are abnormal or compulsive behaviors. They protect the gorillas with the isolation of their large swampy forest areas. The forest of the Republic of Congo is currently considered to host the majority of the western lowland gorilla population.
These areas support the gorillas in both the wet and the dry season of the forest. Swamp forest is now considered an important food source and habitat for the western lowland gorilla. These gorillas favor areas where edible plants are more copious. They have been known to avoid areas with roads and farms that show signs of human activity.
Western lowland gorillas are not typically observed in areas that are close to human settlements and villages. The average amount of rainfall in the areas where western lowland gorillas typically reside is about 1,500 mm (59 in) a year with the greatest rainfall between the months of August and November. They live in primary and secondary lowland tropical forest at elevations that extend from sea level up to 1,300 m (4,300 ft). Western lowland gorillas primarily live in rainforest, swamp forest, brush, secondary vegetation, clearing and forest edges, abandoned farming fields and riverine forest. This style of movement requires long arms indeed, the arm span of western gorillas is greater than their standing height. Western gorillas frequently stand upright, but walk in a hunched, quadrupedal fashion, with hands curled and knuckles touching the ground. Zoo owner John Aspinall claimed a silverback gorilla in his prime has the physical strength of seven or eight Olympic weightlifters, but this claim is unverified. Males in captivity, however, are noted to be capable of reaching weights up to 275 kg (606 lb). Males have an average weight of 140 kg (310 lb), females of 90 kg (200 lb). Among these teeth are strong sets of frontal canines and large molars in the back of the mouth for grinding fruits and vegetables.Ī male standing erect can be up to 1.8 m (5 ft 11 in) tall and weigh up to 270 kg (600 lb). Other features are large muscles in the jaw region along with broad and strong teeth. They have short muzzles, prominent brow ridges, large nostrils and small eyes and ears. Their hands are proportionately large with nails on all digits (similar to those of humans) and very large thumbs. This coloration is the reason why older males are known as "silverbacks". The hair on the back and rump of males takes on a grey coloration and is also lost as they get older.
#Western lowland gorilla silverback skin#
They possess no tails and have jet black skin along with coarse black hair that covers their entire body except for the face, ears, hands and feet. This species of gorillas exhibits pronounced sexual dimorphism. The western lowland gorilla is the smallest subspecies of gorilla but still has exceptional size and strength.
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