How long does it take for bird ( maybe!! A robin egg) to hatch?
1egg isn't gonna hatch cuz I think it's empty cuz. it floats in water...but the rest.. they are getting heavy... only after 4 days? is that good... ? one egg thats heaver then all the others... does that mean they are growing? and how long do you think till they hatch cuz I found it takes 10-20 days..?? but I not sure