Hey, dlogan. Wild emu chicks hatch on the first of Spring. Now, here at Planet Rothschildi, that's good and cold (and wet and windy), though way short of snow.
But in the eastern states of Australia, emu territory extends to the lower edges of snow country -- but I have no knowledge of those emus ('Novaehollandiae').
The best observations we've had of really young chicks were of 'Alpha and Omega' about ten years ago. Of course, they get to cuddle in under Dad at night, but at first light, they were out in all weathers, soaking wet from the neck down, shunting their way through the grass.
Meanwhile: can we turn this whole discussion back to front? Wild emu chicks -- literally from the day they hatch -- are moving about, browsing. I suspect that even chicks small enough to sit in a bucket cover a couple of miles a day, and make hundreds of 'snatch and grab' motions: strong legs, strong necks.
In short, I think chicks are much hardier than folks think, and they need all the exercise they can get.
Supreme Emu, Lake Muir, W.A.