Answer by  
                                                                                          Anonymous
                                                            
                          
                          
                                                          the main difference is in the genes. a horse has 64 chromesones, donks have 62, therefore a mule/hinny has 63. most mules/hinnys are sterile, but there have been cases where they have produced offspring. a mule is a male donkey female horse. hinny male horse female donkey.