Since I received them this past Thursday (26th) they have been on aspen. The male burrowed initially but as I type is laying on top near one of his hides. The female however has pretty much stayed underneath...moving back and forth from hot side to cool side every now and then. From what I've read this is normal behavior for a blood in order to feel *secure*. Occasionally she will be in either of her hides but still burrowed underneath the substrate. Is this in fact "normal behavior" or something I should be concerned with?