Do Chimpanzees Use Weight to Select Hammer Tools?

Great apes use weight as a cue to find hidden food

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How wild bearded capuchin monkeys select stones and nuts to minimize the number of strikes per nut cracked

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Flexibility of Wild Chimpanzee Nut-cracking Behavior Using Stone Hammers and Anvils: an Experimental Analysis

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Preliminary Assessment of Methods Used to Demonstrate Nut-Cracking Behavior to Five Captive Chimpanzees (Pan troglodytes)

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How to crack nuts: acquisition process in captive chimpanzees (Pan troglodytes) observing a model

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Animal Behavior: The Right Tool for the Job

(2009) Sarah F. Brosnan   CURRENT BIOLOGY

Selection of Effective Stone Tools by Wild Bearded Capuchin Monkeys

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Kinematics and energetics of nut-cracking in wild capuchin monkeys (Cebus libidinosus) in Piauí, Brazil

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Tool use as a way to assess cognition: how do captive chimpanzees handle the weight of the hammer when cracking a nut?

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Do capuchin monkeys use weight to select hammer tools?

(2008) Cornelia Schrauf et al.   ANIMAL COGNITION

Chimpanzees infer the location of a reward on the basis of the effect of its weight

(2008) Daniel Hanus et al.   CURRENT BIOLOGY