Dispersal

The conditions of the habitat in question may be suitable for the species and there may be no problems with other species already occupying that habitat. Ecologists call the ability and propensity of a species to disperse a measure of the species' vagility. Species with high vagility. are both willing and capable of traveling long distances. We'd place most birds in that category. Species with low vagility are either not willing to move from their home site or are unable to move long distances. An example of a species with low vagility is shown below.

Snails have low vagility. Even an alley can limit their dispersal