But compared to the Uni of Google - eBay is winning hands down - a lesson every day.

If you're looking to incubate your eggs, then the only way to tell if the egg is fertile is by incubating it for a few days, and then candling the egg to see its progress.

This involves going into a dark room, and shining a bright light underneath the large end of the egg. If the egg is fertile, then you should see a dark spot around the middle of the egg, with some spider-like veins beginning to form around it.