A little wonder, every day

Capuchins use stone tools to crack nuts

Титульна AI-згенерована ілюстрація / AI-generated cover illustration. Wild bearded capuchin using a stone hammer to crack a palm nut on a rock anvil.

оптимізовано з `media/capuchin-stone-tool.jpg`: 2251×1501 px (половина початкової ширини й висоти), JPEG quality 82.

A bearded capuchin holds a nut beside an anvil; photo by B. Wright, CC BY-SA 4.0. Original page: https://commons.wikimedia.org/wiki/File:Nut_cracking_Sapajus_libidinosus.TIF. Photograph by B. Wright, originally published as Figure 1 in Fragaszy et al. (2013), PLOS ONE; CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/). Required attribution: “B. Wright / Fragaszy et al., CC BY-SA 4.0.” Converted from TIFF to JPEG; no crop or other image change.

AI-generated scene of a capuchin placing a palm nut on a stable stone while holding a stone hammer.

AI-generated explanatory scene showing a stone anvil with a worn depression and a separate hammerstone, with a capuchin in the background.

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Титульна AI-згенерована ілюстрація / AI-generated cover illustration. Wild bearded capuchin using a stone hammer to crack a palm nut on a rock anvil.

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Wild bearded capuchins in Brazil crack hard palm nuts with stones: they place a nut on a stable surface—a natural “anvil”—and strike it with a stone hammer. Field studies have documented this behavior, but it is described for particular populations of bearded capuchins, not for every capuchin monkey.