Help with duck eggs!

[raemcwi]

We are on day 26 of incubating. We have 5 breeds in there-crested, mallard, buff, f&w runners and cayugas. We candled last week and week and saw a lot of movement. 2 days ago we saw 2 eggs rocking back and forth a tiny bit. Nothing yesterday or today and some have clear marks on them. Is that from the duck moving around in the egg?
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[Orca5094]

The dark areas are usually where they are trying to break out. Seems to happen more when they are malpositioned and trying to pip in an odd place, or wrong end of the egg. Some of yours look odd, though (that long narrow line for example). Can you see any external pips at all on any of them? If not, I would suggest candling them all real quick to check if they are still alive. Eggs can also develop dark, weird spots if they have died inside the shells so it's important to know if they are still alive in there or not.