Out of all of the marine mammals on Earth, seals are arguably some of the most endearing. These furry ocean dwellers have adorable puppy-like faces and they can be found in all of the world’s major bodies of water. To get you started, we’ll introduce you to all 33 types of seals. From sea lions to fur seals to walruses, and more! Let's discuss what marks each seal species unique and clue you in to some fun facts about pinnipeds.