Chinchilla sleeping on a rock
Chinchillas come from the Andes mountain range, which are composed of the rock Andesite. Andesite is also common here in AZ.
I went and got a piece and put it in my Chinchilla's cage to weigh down it's plastic castle, so the Chinchilla can't push the castle around.
All the sudden, the Chinchilla started sleeping on top of the Andesite. It is about a 2 inch long piece of andesite, and my chinchilla goes through the trouble of scrunching up just so she can fit on top of it. I went out and got a bigger slab, and will see if she sleeps on that one now.
I thought it was really neat that the chinchilla wants to sleep on top of a volcanic rock. I guess it's an instinct, just like the dust bathing.
I'm trying to upload pictures of the Chinchilla sleeping on the rock.
Maybe it's just a coicidence, and chinchilla's like to sleep on any rock. I didn't even realize it was andesite that I was using to weigh down the castle, until after she started sleeping on it.