Original sentence: True crows have long been viewed as very intelligent by humans (as seen in Aesop's fable of The Crow and the Pitcher) and they often score very highly on animal intelligence tests, some species even top the avian IQ scale
Edited sentence: True crows have long been viewed as very intelligent by humans (as seen in Aesop's fable, possibly factual, of The Crow and the Pitcher) and they often score very highly on animal intelligence tests, some species even top the avian IQ scale