I feel like it's pretty common for kids to try eating dog biscuits and cat kibble and stuff - they look like cookies and breakfast cereal, it probably seems natural at a certain brain-stage.
But why the hell did I groom the cats with my tongue when I was tiny? Was I just not clear on the importance of the species divide in re: which organisms' social interactions I was supposed to be observing and mimicking?
Mom and Dad apparently never caught me doing it, because I remember that the reason I stopped was just that I disliked the texture of the mat of fur that built up on my tongue. I may have actually hacked up a hairball at some juncture, too.