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Re: Meter-wide "dinosaur" eggs reportedly found in Chechnya

On 13 April 2012 17:45, Barry George <paleo@ncf.ca> wrote:
> Does anyone know what the theoretical maximum size is for a terrestrial egg? 
> Shell thickening and decreasing surface area to volume must be catastrophic 
> to respiration at some point...

Alexander (1989:156-157) touches on this in The Dynamics of Dinosaurs
and Other Giants.  He doesn't give a number or even a range for the
size limit due to respiration issues, but does say "even elephant
birds were probably a long way from that limit".  (At 30 cm in length,
they are the largest known eggs.)  He also suggests that elephant-bird
eggs may be near a different limit, in that the shells of eggs much
larger would have been too thick for the chicks to hatch, but no
numbers are given.

No doubt others have looked into this in greater detail, but sadly
Alexander gives no references.

-- Mike.

> In terms of egg to body-weight ratios there is always the Kiwi... and the 
> eggs are able to stay at low metabolic levels in the several-week period 
> after being laid but before incubation.
> -Jonas
> ----- Original Message -----
> From: "Ben Creisler" <bcreisler@gmail.com>
> To: dinosaur@usc.edu
> Sent: Friday, April 13, 2012 12:27:25 PM
> Subject: Meter-wide "dinosaur" eggs reportedly found in Chechnya
> From: Ben Creisler
> bcreisler@gmail.com
> As a rule, I don't post links to some of the "dinosaur" news stories
> from Russian and Central Asian news sources since the facts tend to
> get garbled in the reporting and the translations. This one is so BAD,
> I decided it might be fun to post it on Friday the 13th. It's more
> like what the old Weekly World News used to publish....
> http://www.rferl.org/content/dinosaur_eggs_found_in_chechnya/24547542.html
> GROZNY, Russia -- Scientists in Chechnya say they have discovered a
> cache of fossilized dinosaur eggs in a mountainous area south of the
> republic.
> A team of geographers made the sensational discovery on April 9 during
> an expedition to study two previously uncharted waterfalls.
> "There are boulders on the slopes of the mountain, and among them we
> noticed smooth globes," Said-Magomed Dzhabrailov, a geographer at the
> Chechen State University, told RFE/RL. "We got closer and saw that
> they didn't look like stones. We concluded that they were dinosaur
> eggs, because the shells, the whites and the yolks were clearly
> visible. Their diameter ranges between 63 centimeters and one meter."
> The 40 or so eggs are believed to date back roughly 60 million years,
> toward the end of the dinosaurs' reign on Earth.
> A group of paleontologist has been sent from Moscow to study samples
> and conduct radiocarbon dating tests.
> But the Chechen scientists are "90 percent" confident they have found
> prehistoric eggs, which they think were laid by plant-eating
> dinosaurs.