From the back of the book:
In a world of myth and magic, great heroes travel across the land taming and defeating various beasts and earning their place as legends. But as you adventure through the forests, swamps, and tundras, you quickly realize that there is a lack of creature diversity in your travels. If you are looking for something novel to spice up a fantasy roleplaying campaign, or simply want to see a new take on the creatures of fantasy, Atlas Animalia has all the monstrous variants you’ll need! Showcasing the arctic owlbear, and the tiger griffin, to the lionfish hippocampus there is much to be rediscovered in this new landscape of possibilities!