I set 10 Penedenseca eggs on October 16th from pullets that had just been laying about 2-3 weeks. Of the 10, I pulled 4 clear looking ones late in incubation and opened them. They were clear, no development. Of the 6 that looked to be growing well, ALL 6 hatched last night & today. I'm so proud of my little girls! I guess I have to call them hens now Also, I set these guys to hatch in an egg carton and I will NEVER hatch another way. It was SUPER easy, 100% hatch rate, no rolling around and clean up is next to nothing! I'm loving it!!