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Re: Obligatory parental nest attendance.

In re: dino eggs bigger than turtle eggs: We have on display two fossilized
eggs, prepared by Terry Manning (cover story in National Geographic back in
April '95 I believe, don't have it in front of me). There is no apparent
difference in size, shape, etc. I recall in my research for the display that
Manning made the remark that he had great difficulty telling the two apart,
and often spent months working on the eggs before he discovered which it
really was. Several other eggs in our possession from different sources also
appear to be about the same size.
Ellen Sue Blakey, Education Director
The Wyoming Dinosaur Center/ Big Horn Basin Foundation

John Bois wrote:

> I was wondering if anyone would care to comment on this idea?
> Oxygen is limiting for underground nests.  Many dinosaurs oviposited in
> sand.  Dinosaur eggs were bigger (in general) than turtle and crocodile
> eggs.  They therefore required more oxygen.  They also probably had a
> higher rate of embryonic growth, and so needed even more oxygen.  These
> together made it necessary to have eggs closer to thwe surface in
> order to access that oxygen.  If this were all true, their eggs would not
> have the moderating  effect that a thick layer of sand would provide.  The
> only way to provide this would be for a parent to modulate the various
> optima, by warming, shading, ventilating, etc.
> I seem to remember that most late-cretaceous nests are fairly shallow.
> Comments on or offline appreciated.