A closer examination of the way in which references to animals are introduced, the frequency of allusions to certain species, and the date of the documents in which they are found gives a fair idea of the conditions of the area at different stages of its history. The species, for instance, called in Hebrew 're'em', was very probably the aurochs, or wild ox and totally disappeared about the time of the Babylonian captivity. The wild ass, the lion and a few others long ago became extinct in Palestine. Other species alluded to in the Bible are now extremely scarce.