biome environment Fluvial landforms of streams green habitat landscape nature plant rain rainforest rock Singapore stream Terrestrial plant tree tropical trunk water 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 African-dwarf-crocodile armoured-skin black-crocodile bony-crocodile broad-snouted broad-snouted-crocodile carnivore carnivorous cold-blooded crocodile Crocodilia dense-rainforest dwarf-crocodile habitat-loss nocturnal open-mouthed osteolaemus-tetraspis reptile reptilian rough-backed-crocodile small solitary-animal vulnerable West-African zoo joey mother pouch young youngster