Depends on what you call a species. A cow is a single species (Bos Taurus), but there are different breeds of it.
A Black Angus is very different from a Belgian Blue in the same way that a Peruvian Inca human is very different from a Yoruba African human. Both cows are Bos Taurus, and both humans are Homo Sapiens.
Different breeds were developed to adapt to different conditions and requirements, same with humans who settled different climates and geological regions.
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