The distribution is the area occupied by a population or species, the dispersion is
the pattern of spacing of the animals within it, and dispersal, migration, and local
movement are the actions that modify dispersion and distribution.Dispersal plays a key role in dictating the rate of spread of a species reintroduced
into a new area or of one recovering from catastrophic decline.The limiting factor can often be identified by the
trend in density from the range boundary inward.