Some animal eggs will hatch by the heat generated when microorganisms in the soil and compost decompose organic matter, but these microorganisms (including bacteria) will also penetrate the eggshell and infect embryos  Naturally, this ratio is higher than 20%  However, in In Australia, there is a bird named Congzhong pheasant , whose eggs are only 9% infected  Researchers have found that their eggshells contain lysozyme
The clump Congzhong pheasant emits a special smell that reduces the number of bacteria attached to its eggshell
 Based on this, the researchers believe that the key factor is that this substance is likely to resist Bacteria infestation