Yes, they CAN hear at some point, I don't know when. But they do chirp inside the shell before hatching, and they can hear each other. The internal chirping and noise of hatching encourages and stimulates hatching to begin in the other eggs, too. Or so I've heard!.....I talk to my eggs a bit when I turn them. My husband would think I’m crazy if he knew. Just in case it’s like a human baby where they can hear sounds and recognize voices.![]()