Since 2005, Douglas has registered 83 different jaguars in an area of 350 river kilometers. An amazing number considering that the territory of a jaguar, in the Amazon, is 70 square kilometers.
The different forehead patterns from each jaguar allow the identification of individuals. Each jaguar has a completely different pattern. Douglas Trent, who uses this differentiation in order to distinguish the 83 felines he monitors, was the first to use this methodology on jaguars.