On Unbelievable Stories

It is said that around Mt Pelion and Mt Pholoe there existed double-formed creatures, who were human down to the hips and the rest of them had the form of a horse. This is not true: it is impossible for a being in which are merged different creatures to be born and nourished.

Rather, back when the usefulness of horses was still unknown, the men who first rode horses made raids on the plains and plundered them. To those who first saw them from far off, they gave the illusion that they were created from two creatures.