Guinea pig

Due to Andrew Ketterley's experiments with the Magic Rings, several guinea pigs were transported to the Wood Between the Worlds using the yellow rings. Digory noted their presence there when he arrived in order to save Polly. The guinea pigs seemed perfectly happy with their new surroundings, and rather than return them to the cruel hands of his uncle, Digory decided to leave them there. With no means of leaving the Wood, it can be safely assumed that they remained there, as the Wood's only known permanent inhabitants. It is not known whether or not there were guinea pigs and their talking counterparts in Narnia.