A response on Martin's comments (which were perhaps
written before he saw mine): As for "do Red Jungle Fowl have a similar sized egg
to an Australorp? A relevant question for other reasons but the size of the egg
may make little or no difference to the evolutionary history that I
suggested. And as for "do they make the same ruckus when laying in the wild?"
This is a very relevant question to the evolutionary history that I
suggested and I have mentioned it. Indeed if (and I assume it would be
so) there are potential ground living predators of such things in their native
habitat, they probably do not do this. If so, that would be a major clue that
the behaviour has been established as a result of human selection, whether
deliberately or not.
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