Why are horses and donkeys considered different species, even though they can produce offspring?

Answer 1

That is because their offspring is infertile

Donkeys and horses can have a mule together, but the mile is unable to have offspring of its own. That is why horses and donkeys are considered to be different species - their offspring is infertile

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Answer 2

Daniel Arnold

Horses and donkeys are considered different species because they have different numbers of chromosomes. Horses have 64 chromosomes, while donkeys have 62. Despite being able to produce offspring called mules, which have 63 chromosomes, mules are usually sterile, which indicates that horses and donkeys are genetically distinct species.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.