Another update on the eggs... for anyone that missed my last thread, Yanni, my female tortoise (and the matriarch of the creep) laid 5 eggs on Bank-Holiday Monday. (25th of May)
Here is the thread:
with the video of her laying in.

Today, I candled them, and it looks like ALL FIVE are fertile

You can see the bloodsac in this picture. Inside the egg is a large sac that encompasses the yolk, the embryo and also a sac of air. The yolk gives the embryo the nutrients it needs.

Not sure which picture is of which egg as they all look the same, but hpoefully gota good mix of pics in there so that you can see it