I have a broody Australorp who's been on the nest for a week now. I have a 20 week old RI Red rooster. I assumed that she went broody because the eggs were fertilized. As I have read, that is not always the case. She had 20 eggs under her. I held them all under a flashlight but didn't notice any embryos. It is difficult because of the brown eggs of an Australorp and the green eggs of my EE's. They aren't very transparent. How do you tell if an egg has been fertilized without breaking them open? I cooked four of the 20 she was laying on and did not notice any bullseye. The rooster hasn't been leaving the coop much either. They generally roam free.