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Re: Which eggs may be turned and why

It does depend on the group. For squamates, it is important not to turn the 
eggs after ~12 hours of being laid. This is because the embryo actually 
implants on the dorsal side of the egg, so if you turn it after that, the 
weight of the yolk will crush the developing baby. 

I don't know if the same holds true for crocodylians, or chelonians. I know it 
doesn't even hold true for all squamates, as there are some skink species that 
actively tend the nest, and roll the eggs. 



"I am impressed by the fact that we know less about many modern [reptile] types 
than we do of many fossil groups." - Alfred S. Romer

--- On Sun, 7/4/10, Martin Baeker <martin.baeker@tu-bs.de> wrote:

> From: Martin Baeker <martin.baeker@tu-bs.de>
> Subject: Which eggs may be turned and why
> To: "dinosaur mailing list" <dinosaur@usc.edu>
> Date: Sunday, July 4, 2010, 4:38 AM
> Dear all,
> watching a nature program with my daughter, she came up
> with a smart
> question I was unable to answer:
> A zoo keeper was collecting some reptile (apologies...)
> eggs (I forgot
> which species) and told that it was important not to turn
> them and to
> take note which side was up.
> However, we also saw a nandu rolling his eggs back into his
> nest who
> seemed not to care in the least how he rolled the eggs
> around.
> So the question is: What determines whether eggs can be
> turned or not?
> Does it depend on the clade? The state of the egg?
> something else?
> Thanks for any help,
> Martin.
>    Priv.-Doz. Dr. Martin Bäker
>    Institut für Werkstoffe
>    Technische Universität Braunschweig
>    Langer Kamp 8
>    38106 Braunschweig
>    Germany
>    Tel.: 00-49-531-391-3073
>    Fax   00-49-531-391-3058
>    e-mail <martin.baeker@tu-bs.de>