1. Biro D, Humle T, Koops K, Sousa C, Hayashi M, Matsuzawa T (2010) Chimpanzee mothers at Bossou, Guinea carry the mummified remains of their dead infants. Curr Biol 20:R351–R352
2. Goodall J (1968) The behaviour of free-living chimpanzees in the Gombe Stream Reserve. Anim Behav Monogr 1:163–311
3. Matsuzawa T (1997a) Phylogeny of intelligence: a view from cognitive behavior of chimpanzees. IIAS Rep 1997:17–26
4. Matsuzawa T (1997b) The death of an infant chimpanzee at Bossou, Guinea. Pan Africa News 4:4–6
5. Nakamichi M, Koyama N, Jolly A (1996) Maternal responses to dead and dying infants in wild troops of ring-tailed lemurs at the Berenty Reserve, Madagascar. Int J Primatol 17:505–523