With the help of a good wind , they can smell dead animals from 4 â `` 9.5 kilometres ( 2.5 â `` 6 mi ) away . With the help of a favorable wind and its habit of swinging its head from side to side as it walks , Komodo dragons may be able to detect carrion from 4 â `` 9.5 kilometres ( 2.5 â `` 6 mi ) away .