Because of the need for agricultural land in Africa, preserves cannot be expanded in size. The elephants--each of whom consumes more than 100 kilos of grass per day--have begun to squeeze out other creatures in the protected areas.
由於非洲農地的擴展，保護區面積只減不增，一天消耗一百多公斤糧草的大象，開始擠壓其他生物的生存。