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Performance of tamarins on a long-term memory test compared with joint-interaction testing. Boxes represent the interquartile range containing 50% of the values. The line across the box represents the median value. The whiskers extend to the smallest and largest values (excluding outliers). (a) Latency to open a correct forage site. (b) Number of incorrect visits before locating a correct forage site. *P < 0.05; **P < 0.01.
