Until the late 12th century almost any cultural life or innovation had died in Europe. Christian mysticism and symbolism had completely taken over all the great minds. Thanks to the Arabs and many wars we started to exchange ideas again and rediscover lost authors and wisdom of Greek and Roman origin.
Not only animals, but also culture, art and science can be completely eradicated. Beware of religious fundamentalism, it won’t tolerate any knowledge beside itself and keep it’s followers dumb.