They are real. If you dual form scream near them, you're close enough to get one to screech and start flying up. If you could switch forms while wall clinging, you could probably get it to drop an egg by screaming at it enough, even though you wouldn't be able to get it.
I was pleased to discover that parrots explode:

Also, Fenizrael, where exactly near the monkeys are you jumping from? Arrows would be helpful.
