Ever perceptive, Lucy has the following thought (from Lewis’ Prince Caspian chapter 9):
“Wouldn’t it be dreadful if some day, in our own world, at home, men started going wild inside, like the animals here, and still looked like men, so that you’d never know which were which?”
“We’ve got enough to bother about here and now in Narnia,” said the practical Susan, “without imagining things like that.”
Some talking animals evidently went back to being wild and witless during the long reign of the Telmarines kings. When Trumpkin and the four children have just shot a bear for food on their march to join Caspian, they worry briefly that it may have once been a talking bear.