Why can a duck be helped to crack open an egg an not a chicken egg?

Ducks can sometimes be helped to crack open their eggs because they often have a more flexible shell and a less rigid structure compared to chicken eggs, allowing for some assistance without harm. Additionally, ducklings may benefit from external help as they are generally less developed than chicks at hatching. However, intervening with chicken eggs is less common, as chicks are more self-sufficient and capable of breaking the shell on their own. It's also important to minimize interference to avoid causing stress or harm to the developing embryos.