[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Egg-sistential question

On Tue, 24 Sep 1996, Rob Meyerson wrote:

> A question on dino-eggshells has been put to me recently, and I
> thought I'd put it to the group.
> When one looks at modern reptiles, practically all of them lay eggs
> with a leathery outer shell.  This type of egg is also laid by the
> dinosaurian cousin, the crocodile.  However, this does not apply to
> birds, who lay eggs with very hard shells.
> Are there any thoughts as to when the bird-like egg first evolved?  Is
> it purely an Avian trait, or can it be extended to most/all dinosaurs?

And further out of curiousity, can one tell whether fossilized eggs were
leathery or hard?

+----------+    Rich Travsky   RTRAVSKY @ UWYO . EDU
|          |    Division  of  Information  Technology
|          |    University of Wyoming   (307) 766 - 3663 / 3668
|       UW |    "Wyoming is the capital of Denver." - a tourist
|        * |    "One of those square states." - another tourist
+----------+    http://plains.uwyo.edu/~rtravsky/