A species that exists alongside and often breeds with another related species in the same geographical area.
From co- + species (Latin for 'appearance' or 'kind'). Used in biology to describe sympatric species that share habitat and can sometimes interbreed.
Wolves and dogs are cospecies in some regions—they can actually interbreed and create fertile offspring, which challenges our basic definition of what makes a 'species' distinct from another.
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