DP - MPI Library TY - JOUR AU - Kitahara-Frisch, J. AU - Norikoshi, K. T1 - Spontaneous sponge-making in captive chimpanzees UR - http://dx.doi.org/10.1016/S0047-2484(82)80030-4 T2 - Journal of Human Evolution SP - Vol. 11, No. 1 (1982), p. 41-47 CY - Amsterdam : Elsevier PY - 1982 N1 - Copyright: Copyright (c) 2006 Elsevier Ltd ER -