Cheval, Tête d'un animal, Cheval de course, Vectoriel, Mustang Illustration vectorielle libre de droits http://francais.istockphoto.com/illustration-20014982-cheval-tete-un-animal-cheval-course-vectoriel-mustang.php?st=8429625
Male unicorns have the horn which is used for fighting. Female unicorns typically have the wings of a Pegasus for the flight response. Also baby unicorns have wings to keep up with their mothers. Hollow bones for these mystical beasts must mean a very strong inner structure of their bones to withstand the pressure of their large bodies.