. . . "This is likely to be one of the main reasons why orang-utans show a great deal of parental care, a baby will stay close to its mother for about three years, which is a comparatively long time even among primates, and is thought to recognise its mother, children and other close family members for its whole life, making orang-utan groups fairly close knit communities.Sumatran orang-utans have, unlik" .