I'm fretting over this egg, which has been slowly splitting open over the last two days. I don't know were to call this one dead or wait and see. The eggs would be hatching now or any day now, and while there' no progress there's also no sign of anything that would overtly signal death, like a change in colour or a funny smell... so my wife says wait. How do you know when it's time to give up for good? Or, how would I be able to confirm that a chick is still alive?