In C.S. Lewis' The Chronicles of Narnia, any of a number of inhabitants of Narnia who resemble ordinary animals, i.e., moles, mice, horses, and so on. Talking Beasts are noticeably larger than their non-sentient counterparts (Reepicheep the Talking Mouse was over a foot high). As sentient beings -- persons -- killing and eating a Talking Beast was equivalent to cannabalism. (The Silver Chair)
In the early days of Narnia, there were few Men. After Narnia's golden age, the Men of Telmar took over Narnia, and the Talking Beasts withdrew into hiding. Even after King Caspian's reign, which restored the rightful place of Talking Beasts, they no longer overwhelmingly dominated.