In the animal kingdom the law of the survival of the fittest reigns .There is so much of likeness of the externals. Species of a kind are difficult to identify as unique individuals, one tiger looks just like another. Perhaps they have to fight to prove their individuality of the inside.
On The human side, the facial difference, the hair length, texture, color, the body weight, height, all are so different and yet each soul gifted with a realization understands the unity in diversity. The irony is the ignorant animal kingdom fight to survive and the intelligent human beings think that they will survive if they fight.