Hey I have been reading peoples posts on licking and thought I could shed some light on the behavior.
Next time they lick look at the end of the tongue it has a dark spot in the middle and it almost looks like the tongue is forked, this is similar to any breed of snake. It is called the Jacobson's Gland were the Beardie or the snake like the air and pick up the scent of what the are looking for, this is weaker in Beardies due to there excellent eye sight to bad they have no depth perception lol. It is not as advanced as a snake but they don't need it as much.
sorry to drag on just thought i could shed some light.
Happy reading Matt XD
Next time they lick look at the end of the tongue it has a dark spot in the middle and it almost looks like the tongue is forked, this is similar to any breed of snake. It is called the Jacobson's Gland were the Beardie or the snake like the air and pick up the scent of what the are looking for, this is weaker in Beardies due to there excellent eye sight to bad they have no depth perception lol. It is not as advanced as a snake but they don't need it as much.
sorry to drag on just thought i could shed some light.
Happy reading Matt XD