Our call duck has six eggs that she's been sitting on since about the first week of June. At last observation, two ducklings in the eggs were talking and tapping, two were tapping, and two were silent. We are starting to worry about if they need help or not. They've been talking and scratching for 2-3 days, but there are no visible cracks. I live in Utah and the humidity is usually quite low (20% right now), we've read that low humidity could prevent successful hatching. Any suggestions for what we should do?