Egypt has special geographic location and the mild climate, putting it in a privileged position among the countries of the world. The eastern gateway to Egypt is Sinai Peninsula (the land of turquoise). Gazella dorcas, inhabit Sainai, have decreased because of climate changes and water shortages that adversely affect on the vegetation cover. Also wars projects, oppressive cutting of trees and the industrial development, all these things have led to the crumbling of natural habitats of these rare and important animals.Therefore it was necessary to assess the current status of this species of mammals doing some environmental studies in order to identify the Gazelle's food components, compare it to camel's ones and determine the Disappearance rate.