agile animal arboreal climber color colored colorful colors colour coloured colourful colours dendrolagus-goodfellowi-buergersi distinctive endangered Goodfellow’s-tree-kangaroo highly-threatened jumping-ability macropodidae Marsupial omnivore omnivorous ornate-tree-kangaroo overhunted Papua-New-Guinea rainforest-habitat rare tree-climber joey mother pouch young youngster