We haven’t yet proven ourselves that successful. So it was merely a suggestion that you could confirm or deny in order to help. LOL, that wasn’t intended as an insult and I hope you didn’t take it that way. The surviving hatchlings just scatter, and hope they don’t get cannibalized. Originally Posted by Pong @seagypsy. Are you kidding? They’ve survived for 10s of millions of years. Originally Posted by Pong Originally Posted by Paleoichneum Pong: what is the source of your assertion that calcified eggs are a Cretaceous development? Jurassic sauropod eggs were up to 5mm thick, had a microcrystaline structure and were notably hardened.