animal arboreal brazilian colored colorful colors coloured colourful colours distinctive diurnal endangered-species forager foraging golden-headed- tamarin golden-headed-lion-tamarin leontopithecus-chrysomelas lion-tamarin mammal monkey New-World-monkey omnivore omnivorous primate Singapore-zoo small tropical-rainforests-habitat zoo branch Callitrichidae eyes face fur golden lion mamoset Nyberg tamarin