Do Monkeys Use Tools? Stone Hammers, Sponges and Probes

Tool use was once treated as the line between humans and everything else, then as the line between apes and everything else. Monkeys have quietly erased both versions of that line. Wild capuchins use stone hammers heavy enough to need two hands, wild macaques use stone axes on shellfish, and in each case the skill is learned from other group members rather than invented from scratch by every individual.

What Counts as a Tool

Researchers generally define a tool as an object held and used to change something else, which excludes a branch a monkey simply stands on but includes a stone used to crack a nut. It is a useful distinction because it separates casual object manipulation from goal-directed problem solving, the ability discussed in monkey intelligence.

Capuchins: The Stone Age of the New World

Bearded capuchins in the dry forests of Brazil are the best studied monkey tool users on earth. They select stones by weight, carry them to logs and boulders that serve as anvils, position palm nuts in shallow pits worn into the surface, then raise the hammer above their heads and strike with both hands. Young capuchins spend years getting this wrong, and the archaeological record at some sites shows the same anvils in use for centuries. Capuchins also use sticks to probe crevices, leaves as cups, and stones to dig for tubers, which is why they dominate our list of the smartest monkey species.

Macaques: Stone Tools on the Shoreline

Long-tailed macaques on islands in Thailand and Myanmar use stones as axes and hammers to open oysters, sea snails and crabs, choosing different stone shapes for different prey. Nearby, Japanese macaques handle and stack stones in a behaviour with no obvious payoff, apparently for its own sake, while temple-dwelling macaques across South Asia have learned to use human objects opportunistically. These populations are profiled in Asian monkeys.

Learning, Not Instinct

Tool traditions are patchy. Two capuchin populations in similar forest a few hundred kilometres apart may differ completely in whether they crack nuts, which tells us the behaviour spreads socially rather than genetically. Juveniles watch, scrounge leftovers, handle discarded hammers, and slowly assemble the technique. That is culture in the biological sense, and it is explored further in how monkeys learn new skills and monkey play behaviour.

Tool Use and the Body

Ability depends partly on anatomy. Capuchins have a robust hand with a pseudo-opposable thumb, a heavy skull and a short face that lets them deliver force safely, plus a large brain relative to body size. Species with narrow hands built for running along branches rarely develop the same skills. The link between body plan and behaviour is set out in monkey adaptations and monkeys versus apes.

Why It Matters for Captive Monkeys

A monkey that solves problems for a living becomes destructive and distressed when there is nothing to solve. Puzzle feeders, foraging boards, nut-and-stone setups and scatter feeding are not luxuries for capuchins and macaques, they are the equivalent of exercise. See how to keep a monkey mentally stimulated, enrichment ideas and the capuchin care guide.

Frequently Asked Questions

Which monkey uses tools the most?

The bearded capuchin of Brazil, which uses stone hammers and anvils almost daily in some populations.

Do monkeys make tools or only use them?

Mostly they select and modify slightly, for example stripping a stick or choosing a stone by weight. Manufacturing complex tools is rare outside great apes.

Do all monkeys use tools?

No. Tool use is concentrated in capuchins and a few macaque populations, and most monkey species show little or none in the wild.

Do monkeys teach their young to use tools?

Active teaching is rare. Young monkeys learn by watching, copying and practising alongside tolerant adults.

Continue with monkey intelligence, mirror self-recognition in monkeys and how monkeys find food.