* No Central Record: There's no global database or record-keeping system for animal burial practices, especially from ancient times.
* Cultural Variations: Burial practices varied greatly across cultures and time periods. Some cultures may have buried horses whole for religious or ceremonial reasons, while others may have only buried specific body parts or cremated them.
* Archaeological Discoveries: Archaeologists occasionally uncover evidence of horse burial, but these discoveries are often incomplete or limited to specific regions.
Therefore, any attempt to quantify the number of horses buried whole would be highly speculative and unreliable.