Once again we have the situation where, as more information has come to light, the Bible has been shown to be not only accurate, but accurate in minute detail.
Snakes do deliberately and purposely eat and lick dust.
There is an organ in the roof of a snake's mouth called 'Jacobson's organ'. This helps the snake to smell in addition to its nose. Its darting, forked tongue samples bits of dust by picking them up on the points of the fork, which it then presents to its matching pair of sensory organs inside its mouth. Once it has 'smelt' them in this way, the tongue must be cleaned so the process can be repeated immediately. Therefore serpents really do lick dust and eat it.