Chicks dust bathing?

[EMS83]

I'm sure this is a dumb question, but is it ok/normal for 2 week old chicks to dust bathe?? I gave them dirt as grit to go with the little kitchen and yard tid bits I've been giving them. They love the dirt! Both to peck at and to bathe, or nap in. They make a royal mess in short order, which is fine. I guess I'm wondering if they're doing this because they have mites, or just because it's instinct?

 

[sourland]

Just a natural instinct.

 

[TLWR]

Instinct. My earlier batch of 2 this spring were dust bathing the first time they hit the ground!
The current 2 haven't figure it out yet.