Fricke, H.; Hissmann, K.; Schauer, J.; Reinicke, O.; Kasang, L.; Plante, R.: Habitat and population size of the coelacanth Latimeria chalumnae at Grand Comoro. Environmental Biology of Fishes 32 (1-4), pp. 287 - 300 (1991)
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.