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Re: Megapodes!



Chris Collinson (chris_collinson@hotmail.com) wrote:

<However, they [Megapodes] do not simply semi abandon them until
hatching in the manner of crocodilians, but rather hang around
(both parents) in order to regulate the temperature by removing
or adding material to the nest.>

  Another myth to dispel ... in alligators at least, the mother
does remain attentive to the nest during and after hatching,
caring for the young. I don't know of the behavior in nile
crocs, salties, gavials/gharials, caimans, etc., however
portraying the myth that reptiles like crocodilians are bad
mothers isn't going to help.

  Anyway...

  Greg Paul offered a figure in PDW of a tyrannosaurid
(*Albertosaurus libratus*, or *Gorgosaurus*, if you prefer)
laying attentive to a nest-mound, but not on it. Technically,
after a certain size, I do not think that theropods would have
been able to brood, but since the majority are under the
"scrambled-eggs squatter" size, brooding could still be
performed effectively by animals down to *Eoraptor*, whose arms
are certainly long enough to lay backwards and breast the nest.
Ornithischians may also brood below the threshhold in the same
manner, so as Tom pointed out, the various *Psittacosaurus*
specimens preserved on their chest with the arms splayed out and
backwards, could esily have brooded. The need in hotter climates
for open nests may have driven the need for "sunshades" ... or
that this was started with open nests in the Triassic. Who
knows. Would love to find a Ischigualasto nest, and a
*Herrerasaurus*/*Ischigualastia* fighting pair with the nest
nearby ... it would be so totally killer...

=====
Jaime A. Headden

  Aaaaaaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhr-gen-ti-na
  Where the Wind Comes Sweeping Down the Pampas!!!!

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