back, and wedge. copulate between group Young, and less often prime, estrous females visit neighboring unit group and copulate at Gombe, Mahale and Ta. Bonobo unit groups occasionally mingle peacefully, and copulation by members of different groups occurs at Wamba and Lomako. Adult copulate dorso-ventral 49 males do not interfere with such copulations. copulate dorso-ventral Male mounts female from rear. Major copulation pattern of mature males and females in chimpanzees and bonobos. See video. See also video interfere in copulation. copulate ventro-ventral Male mounts female from front. Occurs rarely in adolescent females and immature male chimpanzees. More common in adolescent females and mature and immature male bonobos. copulation pant See pant in copulation. copulation scream See squeal in copulation. copulatory dart See dart. copulatory squeal See squeal in