Gupte, P. R.; Koffijberg, K.; Müskens, G. J. D. M.; Wikelski, M.; Kölzsch, A.: Family size dynamics in wintering geese. Journal of Ornithology 160 (2), pp. 363 - 375 (2019)
Scientists studying a rare population of tool-using chimpanzees have found that aging can have a profound impact on their abilities—but not all chimps decline equally.
