Tried to use a stethascope to hear the heart beats in my Call eggs this a.m. All I am picking up is like this background noise, that doesn't sound like a heartbeat at all. I figured the heart beats would be fast, but I am picking up no distinction between the eggs that I just candled yesterday and know are good opposed to those that I am 99% sure are not viable. I don't really know what I am listening for. The eggs I am pretty sure are gone are Black Call eggs. They have been very hard to candle, but as of a few days ago one developed a shadow, and the others none, so I at least know I should be seeing something. We are on day 20. Any help would be great because I am afraid the Black Call egg with the shadow may be more of an egg gone bad thing, and I don't want to comprimise the two Butterscotch that I know are good by leaving it in there and risking explosion, but I don't want to toss it when it could be a little duckling. Errrr! LOL. Thanks!