The tropical adaptation of  Brahman Zebu cattle was almost certainly developed by natural selection in tropical areas. The extent to which this adaptation was achieved concurrent to the divergence of the humped from non-humped cattle can only be speculated. But it must be remembered that not all tropically adapted cattle are humped, especially in Panama and most Latin American Countries. Most other characteristics of Zebu cattle are a result of their own natural selection in tropical environments. Their skin repels the sun’s rays and prevent skin damage. The long, agile ears are used to flick insects away from the face and eyes.