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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.