All cats by nature desire to know. An indication of this is the delight they take in their senses; for even apart from their usefulness they are loved for themselves; and above all others the sense of sight. For not only with a view to action, but even when they are not going to do anything, they prefer seeing (one might say) to everything else. The reason is that this, most of all the senses, makes one know and brings to light many differences between things.
This is, of course, what Aristotle says in the first paragraph of the Metaphysics, except he says it about humans. We tend to think of the pleasures of the mind as distinctively human. But a focus on pleasures of the mind is not distinctively human. Observing and exploring are our cat’s most driving pleasures.
The difference between humans and other animals may lie in the type of intellectual pleasure. Aquinas distinguishes the rightly ordered pursuit of understanding from the vice of curiositas. The main difference is that in the virtuous pursuit, one seeks an understanding of how the world explanatorily fits together, rather than a mere listing of facts of the sort one gets from mere seeing (here’s a tree, here’s a squirrel, etc.).