        Twilight giggled.  Most adult ponies only stood on their hind legs to make a point, or to make themselves look bigger, and even then, it was more of an earth pony trait.  On the other hoof, foals often stood up.  Some psychologists though it was because of an inferiority complex; Twilight thought it was so they could reach things that were taller than them, which would explain why the habit fell off as unicorns developed their magic and pegasi their flight skills, while it remained in earth ponies.  “Do you think it’s larger than most creatures on its world?”