        He acted oddly hesitant when she reached one small central area, and his face reddened again.  Could it be he didn’t know what those parts were called?  Maybe he didn’t have them.  Many equine gross anatomy drawings included wings and horn, to save on printing.  Some foals—especially in primarily unicorn cities—often were embarrassed if they lacked horns.  It was less of a problem with pegasi foals, since by their nature, cities like Cloudsdale had no non-pegasi residents.