Re: ANKYLOSAURS THE MOVIE

[Bill Adlam <bill.adlam@st-peters.oxford.ac.uk>]

On Thu, 11 May 1995 FEUKAC@PLU.edu wrote:

>  So what you are actually wanting to talk about is live birth. I suppose 
> one question would be to ask if there are any birds that give live birth? 

No-one's ever caught one doing it.

> I don't know of any but could that have any relevance. Placental Dino's 
> sounds interesting. Hypothetically if some Dino's were 'placental' would they 
> have to be endothermic?(funny how that issue keeps popping up)  I suppose it 
> could be all speculation until we find a fetal skeleton or embryo within 
> the parent.

Placentation has evolved more than once in sharks.  At least some of them are
endothermic but a bit poikilothermic (they are warmer than their surroundings
due to metabolic heat, but very in temperature just as much as the water 
around them).  Live birth in general is found in some fish, lizards and snakes
- also some amphibians brrod their eggs, which amounts to the same thing.  
There are invertebrate examples, too.
                                                                Bill Adlam