Sex difference in squirrel monkeys' handedness for unimanual and bimanual coordinated tasks

► First study on handedness for a bimanual coordinated task in 37 squirrel monkeys. ► Left-hand bias in males for the bimanual tube task. ► Right-hand bias in females for unimanual reaching when vertically clinging. ► Comparative approach: contrast of handedness between arboreal/terrestrial primates.