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RE: Microraptor hanqingi, new species from China.

> I think sleeping in trees came next-to-last, followed only by nesting in 
> trees. That's because to sleep in a tree, you need a way to hold yourself in 
> there _while sleeping_. That can be a specialized foot, a big hole in the 
> tree, or a nest; ways of building nests in trees may not be very easy to 
> evolve, and finding holes big enough for anything the size of *Archaeopteryx* 
> or *Xiaotingia* or *Anchiornis* or any kind of *Microraptor* is difficult. -- 
> I'm sure I've overlooked other possibilities. What are they?

Enlarge the hole in a tree.

Lay down on the branch.

 Granted, the koala method (plop down at the fork of branches and shove one's 
bottom into the split) isn't really an option for archosaurs.