Metapopulation consists of separated populations of the same species that interact on some level. It describes a species that is present in fragmented habitats. Because of this separation, these populations tend to have a lot of fluctuation in population size, which sometimes results in extinction. A metapopulation is generally considered to consist of several distinct populations together with areas of suitable habitat, which are currently unoccupied. A common example of this is the model of pests in agricultural fields or salamanders in a web of small ponds.