Jang, H.; Boesch, C.; Mundry, R.; Kandza, V.; Janmaat, K.: Sun, age and test location affect spatial orientation in human foragers in rainforests. Proceedings of the Royal Society B: Biological Sciences 286 (1907), 20190934 (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.