The common marmoset is a social monkey that lives in Brazil. They form small family groups and have a defined territory. Parents, aunts, uncles and older siblings all help to raise the young.
The researchers set up a compartment with a laptop screen in 12 family group territories in the Brazilian forest. Once the marmosets became familiar with the box, the researchers showed the monkeys either a video or a still-image of a marmoset opening a box.
The wild marmosets watched the video or saw the still-image before they encountered the box with a banana sitting inside.
A wild marmoset watches an unfamiliar female marmoset pull open a drawer to get a banana prize.
With the clear box in front of it, a wild marmoset watches another marmoset open the box and grab a banana treat inside of it.
A wild marmoset eats a banana after pulling open the drawer on a puzzle box. It's possible that the marmoset learned how to open the box after watching a video of another marmoset do the same thing.
A wild marmoset pokes its head outside of the compartment used in the social learning experiment. The study helps researchers understand how marmosets may learn from one another in the wild.