"Starting with the assumption that loanwords reflect change in environment and way of life, we get the following picture of the new country of the Indo-Iranians. The landscape must have been quite similar to that of their original homeland, as there are no new terms for plants or landscape. The new animals like camel, donkey and tortoise show that the new land was situated more to the South […] This picture, which is drawn on exclusively linguistic arguments, is a strong confirmation of the traditional theory that the Indo-Iranians came from the north. […] as we have seen above, there are reasons to believe that the Indo-Aryans formed the vanguard of the Indo-Iranian movement and were the first to come into contact with the original inhabitants of the Central Asian towns. […] the Iranians […] were pushing from behind."