Yes, they will open and shut their beak as they are absorbing that yolk. This hatching thing can be heartbreaking I know! We've lost a few quail chicks and they are usually the ones the kids have chosen as their favourite!
:hugsIt's bad enough wondering if you 'might' have to step in at some point. Even worse when you know at some point it's all on you (sorry, that probably makes you feel even worse - but you can do it)! I'd give them as much time as possible and hopefully they will start to get vocal when they...
Were they due to hatch today? Leave it and see what happens. Make sure your humidity is nice and high - as high as you can get it with wet cloths and sponges etc. Just leave them be and hopefully they will do what they need to do, then be ready to enter the world. If the membrane starts to...
Has the chick made any attempt at breaking into the air cell. It's more than likely no where near ready to hatch, even if it has. I'd make a tiny hole in the air cell so that they have access to oxygen, then just leave them for quite awhile as the chick pips externally then usually sets about...
Generally one chick dies earlier on in the incubation period and ends up killing the other due to the bacteria build up as the dead chick starts to break down. Most people won't set double yolkers because of the risks. Better to fill that space in the incubator with an egg that has a better...