Re: Regarding Spinosaurus

["David Marjanovic" <david.marjanovic@gmx.at>]

> when you evolve this big sail, you have to have a practical use
> for it and not only for impressing other members of your genus.

Which is about the most practical use there is.

> The problem is that if a Ouranosaurus dumped it's heat, it takes some time
> to do so, leaving it open to attack for a hungry Carcharodontosaurus or
> Spinosaur. Evolution has always been about survival, not suicide.

Who says it had to stand still during that? You sweat _while_ you run, not
just afterwards or even before.
Evolution isn't at all about survival, it's about reproduction. Survival is
only of interest as long as it is necessary for reproduction.

> Carcharodontosaurus didn't have a sail, so if he had to avoid heat-

retention

> [...], he dug himself in to the ground?

*Carcharodontosaurus* was full of air-sacs that even extended into its tail.
Maybe this is an answer (just speculating). *Paralititan*, as a titanosaur,
should have been pretty hollow likewise.

> if all these animals in the Sahara evolved these sails,
> Spinosaurus, Ouranosaurus and Rebbachisaurus,

That are just three.

> The Anaconda isn't a creature that is known for it's small size, the
largest
> one recorded was about 12 metres, coming close to a adult Spinosaurus.

In length, maybe; in volume, never. Is an anaconda thicker than the
vertebrae of *Spinosaurus*?

> It's
> is known that these creatures can live for several months on the remains
of
> their last lunch, a large crocodile or something like that.

They are cold-blooded and spend most of their time lying around.
*Suchomimus* at least looks like having spended much of its time at least
standing, if not walking, and was pretty certainly warm-blooded.