Current knowledge on the social organization and behavior of gorillas is dominated by results from research on mountain gorillas though there are some data for eastern and western lowland gorillas. The minimum group size for all subspecies is two individuals usually a silverback and a female , except for males ranging alone, while maximum group size varies slightly for each subspecies Yamagiwa et al. The maximum group size for mountain gorillas can exceed 20 individuals, while eastern and western lowland gorillas generally are not found in groups larger than 17 to 20 individuals and western lowland gorilla groups are always observed in groups smaller than 20 individuals Yamagiwa et al. Mountain gorillas live in age-graded groups of, on average, 9. Natal dispersal is much more common for females than for males in mountain gorillas Watts In general, females emigrate from their natal groups to avoid inbreeding.
She was involved in an incident in , in which she tended to a three-year-old boy who had fallen into her enclosure. Binti Jua whose name means "Daughter of Sunshine" in Swahili is the niece of Koko , a gorilla whose linguistic accomplishments have been the subject of several scientific studies. Her father is Sunshine, from the San Francisco Zoo. Binti Jua has a daughter named Koola with a wild-born silverback called Abe. She also has a son named Bakari with another wild-born silverback, Ramar, who was purchased by Jack Badal as a baby and was trained to do circus stunts. Ramar inspired a book called Jungle to Stage.
A silverback right with a smaller female gorilla. Jealous female gorillas ply their silverback with sex to fight off the competition, a study suggests. Researchers at Zoo Atlanta in Georgia found that the female apes were more amorous on days their peers were having sex — even when they could not fall pregnant themselves. Dr Tara Stoinski and her team monitored four female apes for two years, counting how often they approached their mate and actually had sex. According to New Scientist magazine, even females who were already pregnant or breastfeeding young copulated more often when their peers were on heat.
It was somewhat of a traumatic leave-taking-in fact, they had to tranquilized-but everyone hopes it will be for the best. He may be in for a rude awakening. Bebac and the others are African lowland gorillas. They were born and have grown to adolescence with their gorilla families, or troops, in the Great Ape House at the Lincoln Park Zoo, but now zoo officials have decided it's best for everyone to put them in an all-boys group and send them to the Cleveland Zoo.