Yesterday I mentioned the word "species." What is a "species"?
A common definition is "that of a group of organisms capable of interbreeding and producing fertile offspring of both genders, and separated from other such groups with which interbreeding does not (normally) happen."
So, although seahorses, sea dragons and pipefish are in the same family, they are not all the same species, and so don't interbreed with each other.
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