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Re: Bird reduce their "heating bills" in cold climates
Fuzzy integument is still contentious for ornithischians (and
Doesn't *Tianyulong* show that it can happen?
Even if it turns out to be true for a few species, it seems more
likely that it was an independent development rather than an inherent
character (i.e. not feathers).
Given pterosaurs, saurischians, and *Psittacosaurus*, it might well be a
symplesiomorphy. (*Psittacosaurus* shows that "quills" don't need to
cover the entire body, so I'm not saying the first ornithodiran was
fuzzy all over!)
As for autotomy, it's not really an issue. [...]
Another possibility is that Leaellynasaura might have been arboreal,
and the tail may have been used in a semi-prehensile fashion as seen
in modern day green iguanas.
The anatomy of the tail and the rest of the body make that very