A chicken egg surrounded by human feces inside an ancient cesspit for 1,000 years has been unearthed in Israel, the Israel Antiquities Authority (IAA) said on Wednesday.

The complete egg was discovered in an industrial complex dating back to the Byzantine period, in what is now Yavne.

'Eggshell fragments are known from earlier periods, for example in the City of David and at Caesarea and Apollonia,' the IAA's Lee Perry Gal, a leading expert on poultry in the ancient world, said in a statement.

'But due to the eggs' fragile shells, hardly any whole chicken eggs have been preserved.' 

Also buried inside the ancient human waste was a collection of Islamic-period bone dolls, known as Coptic dolls, that were used as toys.

The complete egg is about six centimeters tall and had just a few cracks on the shell, but no pieces of the outer layer were missing when it was pulled from the cesspit.

Alla Nagorsky, an archaeologist with IAA, also noted that 'even today, eggs rarely survive for long in supermarket cartons. It's amazing to think this is a 1,000-year-old find!'  

‘We're going to take the remains and extract some collagen to try to do DNA sequences.'

Poultry farming was introduced into Israel 2,300 years ago, during the Hellenistic and Early Roman periods.

In the Islamic period, from the 7th century onwards, there is a marked decrease in the percentage of pig bones at sites in the region, reflecting the prohibition on eating pork.

'Families needed a ready protein substitute that does not require cooling and preservation, and they found it in eggs and chicken meat,' explained Perry Gal.

How the egg ended up in the cesspit is still a mystery to archaeologists, who admit they will likely never know the answer.

Also hiding in the pit of human feces were three bone dolls that were likely toys 1,000 years ago.

These Coptic dolls first appeared in Egypt and Palestine around the same time as the Arab conquest.

The excavations in Yavne are be conducted to clear the way for new residential construction and have been going on for months.