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RE: Spinosaurs as what?
Renato Santos wrote:
the animal could use its shade as a way to diminish the glare the water's
surface produces thus being able to see the fish more clearly.
Dorsal sails are also seen in _Ouranosaurus_ and some "pelycosaurs".
_Altispinax_ may have had a sail too; although it's also been suggested that
its elongated spines supported a hump rather than a sail.
The idea that _Spinosaurus_ used its sail as a shade-giver is interesting,
but highly speculative. It's also undermined by the fact that evidence for
dedicated piscivory in spinosaurs is ambivalent. Interestingly, there is an
old idea that the ancestors of birds originally evolved wings for this
purpose (as shade-givers to lull fish into coming close, as in modern
herons): the larger the wing, the more shade it could generate. This idea,
like so many others that attempted to explain the origin of incipient
feathered wings, has been largely discredited.