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The poor quality of data on dromaius novaehollandiae drives me up the wall! Every thimblebrain Safari Park Guy is happy to churnalise stuff that's untrue: 'This male has been sitting on these eggs for a few months now.' Really? Three months? Six? Ten?
My point is that there's so much to learn about the time between the copulation and any given male choosing to begin the incubation. You mention that an egg froze. I surely don't question a first-hand observation. Is it possible that the 'modes' are different in different geographical regions? that emus DON'T, in snowy regions, leave their eggs sitting on the ground ('pre-nest'), under a few leaves and twigs, for days before the male chooses to sit on them? That is, that emus in different areas have different practices that have never been researched?
Although we finally got all manner of titbits of info from Planet Rothschildi, we gotta remember that it's only one emu environment (about 'mid-range': pretty durn cold in winter, but now snow).
There is . . . somewhere . . . a Youtube clip by 'envirowarrior,' you'll have to hunt it down, that has THE ONLY intelligent info I could find on pre-nesting. It shows a pre-nest: emu eggs. On the ground. Covered. Not being sat on. We assume fertile. The only other quality info came from Emu Hugger.
Somewhere I read that five eggs is the 'quorum' that triggers the male's decision to undertake an incubation. There is an clear evolutionary logic to this.
One could get a Ph. D. on this aspect of emu life. Wish I could . . .
Supreme Emu
Wheeeee!! I'm here, Yinepu (with my head under a sheet). Just got your question:
My place ('Planet Rothschildi') is on the very bottom left corner of Oz. We have here what we think are bitchin' cold winters. However, most Australians wouldn't know what a real winter was if it fell from the sky on their head. So, at worst here, Yinepu, we get a fair frost two days in a row. It snowed once when Granpa Jones was a kid.
We get a lot or rain at times, and wind-chill factor.
As I noted elsewhere, there is snowsnowsnow on the southern section of the Great Dividing Range.
S.E.