Why are zebras and horses not considered the same members of the same species what can they not do?

Zebras and horses are not considered the same species primarily because they belong to different genera: zebras are in the genus Equus alongside horses, but they are distinct species with unique physical and behavioral traits. One key reason they are classified separately is that they cannot produce viable offspring together; while they can interbreed, the resulting hybrids (such as a zorse) are typically sterile. Additionally, their differing social structures, habitats, and adaptations further differentiate them as separate species.