I have just recently gotten in to the emu business. I am incubating some eggs in an older cabinet style incubator. I have read up on the requirements for emu eggs during incubation and have kept the humidity and temperature in the range. It is now day 51 and they have been steadily losing weight the way they should however I am concerned that they aren't going to hatch. I have tried talk to and whistle at them to entice a wiggle however I have yet to see or hear anything from them. Should I be concerned that they will not hatch and when should I assume that they are dud eggs and take them out of the incubator? Please help.