Data on home range size and movement patterns of large carnivores are typically collected over the span of a few years and are primarily constrained by the battery life of conventional GPS collars and the limitations in funding multi-year studies. For mountain lions (Puma concolor), the largest North American terrestrial carnivore, the pattern has generally been the same. Given a fixed time to conduct an investigation, it is appropriate to have a larger sample of individuals to identify variation in resource selection across a population of individuals, rather than a longer period with fewer individuals. However, interesting natural history information can be missed with shorter studies along with how an individual responds to a changing environment. We tracked an adult male mountain lion continuously for 7.5 years and examined changes in his movement patterns and home range size as the primary food resource in the region declined. His home range expanded to an area covering 2,500 km2 and during the time monitored he walked approximately 30,000 km (3/4 the distance around the earth). We will discuss factors that may have led to this individual having one of the largest home ranges ever reported for a mountain lion.