animal cute marmoset monkey primate Pygmy Marmoset small zoo appearance baby bedraggled Callitrichidae cling clinging fur furry gripped gripping hairy hold holding-on mammal mother New-World-monkey primates rain raining tail toes wet young arboreal brazilian callithrix-argentata callitrichids colored colorful colors coloured colourful colours distinctive diurnal endangered-species flesh-colored-ears forager foraging mico-argentatus omnivore omnivorous silvery-marmoset Singapore-zoo tropical-rainforests-habitat whitish-silver-grey