TIL the large-eared pika makes "haypiles" in their burrows to see them through the winter

I wondered that myself and assumed they were, in a very roundabout fashion, referring to whatever they called a domicile AS a burrow. It's pretty thin, though. Good catch!

They don't make the burrows, what they use as burrows are naturally occurring. Picture the boulder piles at the the base of mountains. There are tons of rodent sized gaps and cracks between the rocks.

Yes.