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Re: Being aquatic was Re: Obdurodon (was Re: Coronosaurus [...])
David Marjanovic <email@example.com> wrote:
>> We also know that _Baryonyx_ and _Scipionyx_ ate fish. These
>> non-avian theropods also lack any obvious aquatic adaptations.
> They do have adaptations to catching fish. "Aquatic" is usually taken to
> mean "living in water", and *B.* and *S.* didn't live in water.
Yes, I agree. What I was driving at is that certain theropods (avian
or non-avian) could target aquatic prey without needing to be aquatic.
As far as we know, non-avian dinosaurs never became highly
specialized for an aquatic lifestyle (I don't know why). Of course,
birds did; lots of times.
>> and many more show highly refined perching abilities suggesting they
>> were specialized arborealists.
> That's not mutually exclusive with being a specialized piscivore, as
> kingfishers demonstrate today (never mind fish-eating eagles and owls).
Again, I agree. However, specialized perching birds are rare among
known ornithuromorphs/euornitheans basal to Neornithes. By contrast,
specialized enantiornithean perchers are quite common. And they
perched using a hallux that was quite a bit different to that of