Typically, movement between populations of penguins on the various Galápagos Islands occurs, but is minimal. This situation changes when food, which limits the population size, is scarce and individuals must travel farther to find food sources (Boersma 1976, Vargas et. al. 2005). Juvenile penguins move more than adults do as they change and/or establish breeding locations away from adults (Boersma 1976).