Yes, you’re right, preschool and grade school children do identify as animals a lot and they’re often not ashamed to express it, because it’s much more tolerated at that age. It’s viewed as wierd in adults though and it’s much more rare among adult people. Probably partially because it’s a juvenile trait and most people just grow out of that phase , partially because it’s viewed as juvenile (and wierd), so many of those who do not grow out of it are afraid to express it. I find it harmless, so I wish for more tolerance.