Like all callitrichides, Geoffroy's tamarin is diurnal and arboreal.[1] Unlike some other New World monkeys, it does come down to the ground occasionally.[11] This is normally done only in special circumstances, such as to acquire certain foods or to get to a tree it cannot otherwise reach.[3] Group size is generally between three and nine monkeys, with three to five being most common.[8] Groups often consist of more than one adult of each sex.[13] Adults of both sexes migrate between groups.[13] Groups show some degree of territorial defense.[6] Population densities on Barro Colorado Island in Panama range between 3.6 and 5.7 monkeys per square kilometer, but in other areas the population density can be as much as 20 to 30 monkeys per square kilometer.[8] On average, Geoffroy's tamarin ranges 2061 meters per day.[8] Home range size varies between 9.4 hectares and 32 hectares.[3]