Why is the zorse generally not assigned a formal binomial scientific name?
Answer
Because it does not form a self-sustaining population or species.
Under standard taxonomic rules, a formal binomial scientific name (Genus species) is reserved for established, naturally occurring species that can maintain reproductive viability across generations. Since the zorse is a first-generation hybrid resulting from crossing two distinct species within the *Equus* genus, and the resulting offspring are almost always sterile, they cannot form a self-sustaining population. This inability to reproduce prevents the animal from qualifying for status as a distinct biological species, leaving it outside the formal Linnaean hierarchy reserved for stable species.
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