This happened very recently, but I have noticed it with my betta ever since I added Nerite Snails to the tank. Dragoon, my dark copper DSPK has a fascination with other species. For instance, when I first put his Nerite Snail in the tank, he didn't attack the cup the snail was in (unlike his tank-mate, Merlin). He just stared at it. When it was released, he followed it around and got defensive of it after awhile.
Now, this was the most adorable thing I'd ever seen from either Dragoon, or my cat, Renji. They were both fascinated with each other, but Dragoon kept coming over to him and just resting on the side the cat was on. It was adorable! So here are the pictures: