The Amazon region of South America is home to so many different species of animals it can be hard to keep track of who's who, but the black-capped squirrel monkeys tend to stand out from the pack. These tree-dwelling primates have brownish-yellow coats of fur with distinctly darker heads, white masks around their eyes and fuzzy elvish ears. They can be found in many tropical regions from Brazil to Peru and Bolivia, and even as far north as Costa Rica.