Percy Fawcett reported encountering a group of them in 1914. They were extremely hairy, lived in villages and used bows and arrows. They spoke in grunts and lived to the northeast of a tribe called the Maxubi.
Maricoxi are reported as being aggressive to humans. In many encounters, they attack humans on sight. They are said to be scared of the noise of guns.
They are generally described as being between 2 to 6 feet tall with occasional reports of giant homids reaching incredible sizes of 12 feet tall.