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Image Credit

In order of appearance, left to right

http://williamcalvin.com/img/BonoboTooluseSanDiegoZoo028 CALVIN.jpg
http://behavior.uchicago.edu/courses.htm
http://williamcalvin.com/portraits/bonobo/2005SDZ%20143adj.jpg
http://blog.nus.edu.sg/lsm1303student2011/files/2011/04/bonobo-sex.gif
http://faculty.college-prep.org/~bernie/sciproject/project/Kingdoms/animals6/bonobo2.jpg
http://images.sciencedaily.com/2008/10/081013124416-large.jpg
http://www.trionfopublishing.com/images/bonobo.jpg
http://www.theepochtimes.com/n2/images/stories/large/2010/02/26/bonobo.jpg
http://news.bbc.co.uk/media/images/51379000/jpg/_51379424_c.niokiwithlukaya_3.jpg
http://cda.morris.umn.edu/~meeklesr/bonobo11.jpg
https://sciencephoto.com/image/385220/530wm/Z9120202-Bonobo_apes_mating-SPL.jpg
http://4.bp.blogspot.com/-cCrUsEIOvRA/TpiR8-0OzFI/AAAAAAAACGE/mDu06B84ssA/s1600/BonoboMating_main_0224.jpg
http://t2.ftcdn.net/jpg/00/27/01/41/400_F_27014188_SLykywATeYyU4gmGBHvh7AF2OqgU1TMK.jpg