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Re: Subterranean K-T strategies (was "I know why...")



Sea Turtles: Bury their eggs
 
Sharks: Many give birth to live young (more protected from environmental hazards than eggs).  I wonder if modern sharks that lay eggs evolved from species that gave birth to live young.  If so, that would suggest laying protection of eggs during K/T was the determining factor.
 
Mammals: No eggs.  Do platypuses and echidnas protect their eggs by burying or laying in a tunnel - Yes I think.
 
snakes, lizards,crocodiles: bury eggs.
 
 
Frogs:  That's the hard one.  They do not bury their eggs.  Frogs don't seem to fit the vulnerable egg theory. 
 
----- Original Message -----
Sent: Wednesday, July 18, 2001 10:56 PM
Subject: Re: Subterranean K-T strategies (was "I know why...")

In a message dated 7/18/01 4:04:59 PM Pacific Daylight Time,
jodan99@uol.com.br writes:


I'm also not convinced by the current theories of K-T extinctions. Many
groups were killed: dinosaurs, pterosaurs, sea reptiles (with the exception
of turtles), non-Neornithes birds, many kinds of non-Therian and Therian
mammals, but another groups were saved: snakes, lizards, frogs, crocodiles,
placentals, marsupials, etc


Well, *at least a few individuals from other groups* were saved.  The
difference between zero species surviving and one or two (or even ten)
species surviving is not that great.

--Nick P.