As population increases, animal souls are promoted to human before they are spiritually advanced enough in terms of impulse control, etc.: this shouldn't have happened, but karmic progression is automatic, after all--it's a force of nature. But the 'animalization' of humankind bodes ill for civilization.
No doubt the same goes for elves, dwarves, and so on.
A girl living in an isolated hamlet is cursed: So beautiful and sweet-natured that no man can resist loving her, but she has never met the man she could love in return.