There is no single "most interesting" animal, as "interesting" is subjective and depends on individual preferences. Different people find different animals fascinating for various reasons.

To determine which animal is more interesting, I need more information. Please tell me:

* What aspects of animals do you find interesting? For example, are you interested in their intelligence, physical adaptations, behavior, or evolutionary history?

* What kind of animals are you comparing? Are you comparing a cat and a dog, or a dolphin and a shark?

* What are your specific criteria for "interesting"? For example, are you looking for the animal with the most unique physical characteristics, the most complex social structure, or the most surprising abilities?

Once I have this information, I can provide you with a more informed answer.