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Nest-depth phylogenetic bracket?
I'm looking at a cladogram on the inside cover of _Encyclopedia of
Dinosaurs_. I notice that the only species of non-avian dinosaurs whose
depth is known (Oviraptor and Troodon both lay on the surface) are on
separate branches. Can a phylogenetic bracketting argument be put forward
about the nesting habits of other species above and below them on those
branches (including _T. rex_)?