Putting an emu chick outside without a father at 4 days is not natural either--natural is a father role for 12 to 18 months before they are independent.
Neither are skunks, raccoons, nor macaws domesticated as a species; but like many other non-domesticated species, individuals will typically turn out the way they were raised. Of course an emu outside from day 4 isn't remotely domesticated, and like a wild bird or wild raccoon wouldn't react...