Re: Spinosaurs ate pterosaurs

[Tim Williams <twilliams_alpha@hotmail.com>]

Jaime A. Headden wrote:


>   Pardon ... in comparison with what other insectivores? Animals already
> volant? There are several non-flying insectivores that prey on insects
> that can fly, but while being few, they do exist.

Really?  Out of curiosity, what are these non-flying insectivores that prey 
on flying insects?  Do they actually prey on the insects while the insect is 
in flight?  It is a lot more difficult to catch a flying insect than one 
sitting on a leaf.

>   Why do dolphins waste so much energy with barrel-rolls and leaping when
> swimming in pods? What is the energetics expenditure versus animals that
> swim in pods that DO NOT display this behavior? This doesn't seem to
> prevent the dolphins from being so "costly" in energetics.

Doesn't this behavior qualify as 'play', and perform an important role in 
the social cohesion of a pod?



Tim

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