a population that reproduces with another population where their ranges overlap
a type of species that looks a little different, but not different enough to be called a separate animal
A taxonomically distinct subdivision of a species. A group of interbreeding natural populations differing morphologically and genetically, and often isolated geographically, from other such groups within a biological species; sub-species interbreed successfully where their ranges overlap.
A partially differentiated group within a species.
the taxonomic category below species. Sub-species usually occur when a population of individuals become isolated from other communities, eventually evolving and becoming slightly different from the main population. Individuals from the main population and the isolated population can still breed together.
A group of animals or plants that are different from their own species but not different enough to be a separate species, eg. the Stewart Island robin is a sub-species of the New Zealand robin.
Is a sub-group of a species sometimes referred to as a race.