日前发表于《当代生物学》期刊的研究报告指出，黑猩猩会储存石块作为弹药，在生气时扔向动物园游客。这证明先前实验所获结论，即灵长类和人类一样，会为未来预先做好计划。
2006年德国一项实验显示，红毛猩猩和侏儒猩猩能想出用什么工具摘葡萄，而且数小时后仍然记得要带着那个工具。
瑞典隆德大学博士生欧斯瓦斯与3名动物园饲育员共同观察富鲁维克动物园一只雄性黑猩猩桑提诺，逾十年后他发现，这只31岁黑猩猩每天早晨游客入园前，就开始冷静地收集石头，并从大混凝土块上敲下圆盘状的小片。如果这些混凝土太大，他还会将之敲小以适合手握丢掷，它会等到中午再朝围观游客掷去。
欧斯瓦斯说，因为它投不准，很少人真被击中，也从没人受重伤。
雄性猩猩有掌控环境的天性，对环境内有他碰不到的人极难容忍。此研究9日刊登于《当代生物学》期刊。欧斯瓦斯说，桑提诺收集或制造弹药时始终冷静，与攻击时的亢奋有天壤之别。“这证明它不是一时兴起，是以复杂方式在设想未来。“
园方曾在早上将桑提诺关起来，让它不能收集石头，它的攻击性却依然不减。去年秋天决定为它“去势”，因桑提诺特殊行为只在6、7月发生，今夏可知成效。（生物谷Bioon.com）
生物谷推荐原始出处：
Current Biology，doi:10.1016/j.cub.2009.01.010，Mathias Osvath
Spontaneous planning for future stone throwing by a male chimpanzee
Mathias Osvath
Lund University Cognitive Science, Kungshuset Lundag?rd, 222 22 Lund, Sweden
Summary
Planning for a future, rather than a current, mental state is a cognitive process generally viewed as uniquely human. Here, however, I shall report on a decade of observations of spontaneous planning by a male chimpanzee in a zoo. The planning actions, which took place in a calm state, included stone caching and the manufacture of discs from concrete, objects later used as missiles against zoo visitors during agitated chimpanzee dominance displays. Such planning implies advanced consciousness and cognition traditionally not associated with nonhuman animals [1]. Spontaneous and unambiguous planning behaviours for future states by non-humans have not previously been reported, and anecdotal reports, describing single occasions, are exceptionally scarce [2,3,4]. This dearth of observations is arguably the main reason for not ascribing cognitive foresight to nonhuman animals [1]. To date, the surprisingly few controlled demonstrations of planning for future states by animals are experimentally induced behaviours in great apes [5,6,7] and corvids [8,9]. The observational findings in this report suggest that these laboratory results are not experimental artefacts, at least in the case of great apes.
