The horse and donkey are not members of the same species because their offspring are sterile (not fertile).
Why donkeys and horses are not the same species?
A donkey and a horse do not belong to the same species because they do not interbreed naturally. Artificial crosses are carried out between a donkey and a horse and their offspring is known as a mule. A mule is a sterile organism.
Can horses and donkeys produce fertile offspring?
A horse and a donkey can have babies together. A male horse and a female donkey have a hinny. A female horse and a male donkey have a mule. But hinnies and mules can't have babies of their own.
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