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When does "live birth" become a critical survival edge?
Thomas and the Dinosaur Crew? :
As a layperson, I find these questions fascinating. The fast furry
that went on to sweat and milk and live birth aren't the same type of
that evolved into the theropod-like dinosaurs and birds. So what factors
cause those needs. Aren't the hearts of mammals four chambered and birds
I am curious as to when it becomes a bonus to invest time and energy in
offspring as well.
> You may want to have a look at the mammary system in monotremes and see how
> they differ from marsupials and placentals. Although monotremes (echidnas
> and platypi) have their own specializations, they also retain many primitive
> features lost or transformed in other mammals.
- Alan ( visit www.nichimen.com )
PS I meant no slight to Mark "Crash" McCreery nor to Stan Winston. I
the data to show that originally our scary movie monsters were sized