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Re: ptero embryo ID



----- Original Message -----
From: "Dann Pigdon" <dannj@alphalink.com.au>
Sent: Saturday, April 09, 2005 11:27 PM

David Peters wrote:

 JH wrote: You'd expect a lot of anatomical development and change
between embryo and adult.

>>>>>  Not if they were able to fly shortly after hatching (sensu
Unwin). And not if they were days or minutes from hatching as this one
apparently was.

How do hatchling megapodes compare skeletally to adults? They can fly soon after hatching, but they still seem to have the usual juvenile 'cuteness'.

Those features that are not age-related but size-related must still change with growth. An example is relative eye size; relative brain size probably also counts. Those features that are directly related to growth must of course also change. This concerns various sutures and fusions all over the skeleton.