Black tree monitor | Smithsonian’s National Zoo and Conservation Biology Institute https://nationalzoo.si.edu/animals/black-tree-monitor
These dark colored, slender reptiles are endemic to the Aru Islands. They spend most of their lives in the treetops and are extremely agile, curious, and intelligent. Many species of monitor will use their tails as weapons to defend themselves, but black tree monitors are more careful with their tails because they can use them to grasp things like branches to help them climb.
swamps in eastern Indonesia, specifically the Aru Islands off the coast of New Guinea