Zanes dad came and torched the eggs. Most of them died in the egg and some had grown but in the end they all died. This could have been because of the weather.
You can see in the picture below the egg is see through, this means that it was not fertile. The next picture shows an egg that had started to grow but because of the weather it died. The third picture you cannot see through the egg at all which means that there was a chicken in there.