Final answer:
Jean George perceives crows as vindictive because of their reputation in folklore and research which suggests they react based on their treatment by humans and their association with ominous events in literature.
Step-by-step explanation:
Jean George likely says crows are vindictive based on the behavior often attributed to crows in folklore and literature. These creatures have been observed to remember the faces of those who treat them well or poorly and may react accordingly.
This perception of crows being vindictive could stem from anecdotes and research which suggest that crows are capable of holding grudges and may treat individuals who they perceive as threats with hostility or aggression.
The association of crows with negative omens also contributes to this viewpoint, as epitomized in the provided text, where the crow's call foreshadows an approaching threat. This aligns with a broader understanding of animal behavior in literature that often extends human emotions and motivations to animals to enhance storytelling.