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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.
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