Day Journey Length (or “DJL”), also known as “daily travel distance,” “daily path length,” and other terms, is the cumulative euclidian distance that something (in my case, an orangutan) travels over the course of a day. This is a common measure used in all types of animal ecology and animal behaviour research, as it is a simple measure to characterize movement patterns, quantify an animal’s interaction with its habitat, and it is one indicator of energy expenditure.
