Declines in number are therefore of conservation concern, as it can take a long time for populations to rebound. Gorillas have low reproduction rates, with females only giving birth every four to six years after a gestation period of eight to nine months. Both male and female gorillas laugh when they play. Male displays, which use a combination of these calls, also involve charging, strutting and throwing vegetation. The belch noise is a soft contact call used when individuals are out of visual contact, and excited gorillas may bark, hoot, roar or scream. Western gorillas in the Mbeli Bai population were weaned (last time seen suckling) at an average age of 4 years and 9 months, which is 16 months later than in mountain gorillas. Gorillas have a range of vocalisations for communication grunts, whimpers, barks, whines, chuckles and belches are just a few examples. Males and females groom each other to reinforce their bond, and adult males will protect females and their offspring from predators and stronger males who might attack and kill their young.
The strongest social bonds in gorilla groups are male-female. Males may go through a non-breeding solitary period for a few months or years, eventually attracting females and beginning a new family group. Once mature, males and females disperse from the group they were born in to avoid inbreeding. An average group size is about five to 10 individuals, although 50 or more is not unheard of. The largest of the great apes, the gorilla is thought to have shared a common ancestor with humans about 10 million years ago and, today, shares approximately 98% of its DNA with humans.Ī typical family group is composed of one dominant mature male – the silverback – and several adult females and their young.
Poaching, commercial logging and civil wars in the. GORILLAS GORILLA GORILLA (western gorilla) The Ebola virus might be depleting western gorilla populations to a point where their recovery might become impossible, and the virus decimated populations in protected areas by 33 from 1992 to 2007, which may be equal to a decline of 45 for a period of just 20 years spanning 1992 to 2011.
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