Male Veiled Cham Digging Holes

I recently purchased a sub-adult male veiled chameleon, and he seems to be in perfect health and behaving normally, except that a couple days ago he began digging holes in the substrate of his enclosure. I have never seen a male chameleon behave this way (I am certain it's a male - he has very pronounced spurs on his hind feet). Is there any reason for him to be doing this?

 

I'm assuming he also has a very pronounces casque on his head?

 

Yup. He's got the spurs, the casque, and the deeper coloration.
Right after I got him he also strained his abdominal muscles while defecating and his hemipenis was briefly exposed. Indisputably male.

 

Here's a profile image of the casque, I don't have any images of his spurs atm

 

looks more like a girl to me, but I will admit, I am not as familiar with chams as I am with other reptiles.

 

then again, I have things like this fixed in my mind as the epitome of a male veiled. I guess there is more variation to their casques than I thought.

http://3.bp.blogspot.com/_K8DkddotVnQ/R4OoskY_neI/AAAAAAAAAOc/SY00xS3g7vQ/s400/jancontest.jpg

Then again, you did say sub adult.

Is it possible there are insects int he dirt drawing his attention?