The Creature Glossary, located at the Visitor Center, displays the total number of prehistoric animals you have created so far, organized by type. You can change which creatures are displayed using the filters at the bottom, and further sort them after by DNA cost, attack, rarity, etc by using the Creature Sorting button. If you have misplaced a dinosaur on your park, you can easily find them by selecting the dinosaur and then tapping the "Go To" button.