Interesting observation on my emu chicks for you ... they don't, and I mean Absolutely Will NOT, defecate in their nest while sleeping. Sure they do it several times a night. But they come out to do it outside the nest. Without even really waking up!
Fascinating ... at night they are in a small boxed off section of floor covered with a newspaper, and their "Nest" is a plastic green grocer's crate on its side, with a slightly darkened bulb for warmth, rag strip "Feathers" hung from the ceiling, and a newspaper "Curtain" over the entrance. Get the picture?
So the "Emu Dunny" is officially that section of newspaper floor just outside the "Front Door" apparently ... the process is quite amusing ... sleepy Emu suddenly reverses out the curtain, leaving his head inside the nest so we have a headless emu sticking out, squats, squirts, and returns to the nest.
In the morning we have lumps of goodness knows what arranged in a neat row 6 inches outside the curtain. The nest (floored with an offcut of carpet) remains clean. I thinkt here has been one accident where a sleeping emu reversed in the wrong direction and hit a wall instead of getting out ... but that was on their first night in that nest they can choose to leave. Given an option, they strongly prefer not to soil their nest.
Now what's with that??? Very smart I would think ... most birds and animals just do it where they sit or stand and it gets a bit messy. Chooks are terrible at it! So is it just an emu chick thing (I can see why an Emu Dad would rather they did it outside the feathers, I totally agree with the poor guy), or is it an adult emu thing as well ... ie, are all those piles of blessings at the roost sites actually deposited a couple of feet away from where the emu sits?
According to the emu farmers we bought the eggs off, on the (Very rare) occasion that a broody Emu has to 'go' while sitting on eggs, he reverses off the nest just the same. He doesn't like to even do that which is why he doesn't eat. Even offered food right at his head, he shows all the signs of hunger but refuses it anyway. So they do have a good sense of sanitation particularly as regarding nests, which I had never anticipated.
I wish people wouldn't say Emu are dumb ... I see every sign of very good intelligence.