3-Toed Sloth and Tamarin Monkey

The three-toed sloths are aboreal (tree dwelling) mammals from South and Central America. They go to the forest floor once a week to defecate so are usually spotted high up in the canopy on a favored tree for eating their preferred greens. They can be hard to spot! The coarse fur is often a greenish color due to algae growing on it. They certainly can "hang out" using those beautiful long claws.
They are the only members of the genus Bradypus and the family Bradypodidae. This might be the brown-throated sloth being seen in Panama.