animal arboreal brazilian callithrix-argentata callitrichids colored colorful colors coloured colourful colours distinctive diurnal endangered-species flesh-colored-ears forager foraging mammal mico-argentatus monkey New-World-monkey omnivore omnivorous primate silvery-marmoset Singapore-zoo small tropical-rainforests-habitat whitish-silver-grey zoo aroma clingstone color colour cultivars delicate drupes edible firm food fresh fruit healthy jam juicy kernel nectarines nutritious peaches pit Prunus prunus persica var. nectarine red ripe Rosaceae seed skin smooth smooth skin stone stone fruit sweet tasty tree fruit variety whitish flesh whole coloring colouring furry orange prunus persica yellow fruit-tree green growing growth leaves prunus-persica-nectarine ripening Unripe donut peach doughnut peach flat flattened