Subjective assessment of rhesus monkeys over four successive years

Using behaviourally-defined adjectives and a 7-point scale, observers rated all individuals over a year old in a colony of rhesus monkeys every November for four years. Principal component analyses of the ratings provided a basis for the following scores each year: CONFIDENT, EXCITABLE, and SOCIABLE. Two- and three-year old females had higher EXCITABLE scores than males, and adult males were more CONFIDENT than adult females. At all ages,...