The Russian Tortoise 
Agrionemys horsfieldii ( Testudo horsfieldii)  

Russian Tortoise Egg Development



(click on the pictures to view full size)

weighing an egg
Newly laid eggs are fairly heavy.



Russian Tortoise Egg Banding
By 14 days the white spot forms. In a few days it will expand to form a band around the egg.

  egg candling
As the egg develops the tortoise appears as a black spot
  Russian tortoise egg at 6 weeks
At 6 weeks what looks like a bubble forms on top. The embryo (to the right) is much larger.
russian tortoise egg at 7 weeks
Within a week, the egg will appear black on candling. But. with a very bright light and the proper angle, the bubble will seem to have grown. By 8 weeks the "bubble" is much larger as the yolk is absorbed.
  Russian tortoise egg hatching #1
Within 8-10 weeks, the eggs start to hatch. The arrows point to cracks in the egg shell. This is at 66 days.
Russian tortoise egg hatching #2
A few hours later the head pokes out.
  Russian tortoise egg hatching #3
The next day it breaks free.
Russian tortoise egg hatching #5
Wore out and a little dented looking.
  Russian tortoise egg hatching #6
It still has a small yolk sack.
Russian tortoise egg hatching #7
A crease is visible where the tortoise
 was folded in the egg.

Russian tortoise egg hatchinglings
About 2 weeks later, they are eating and growing. The one on the right is from another clutch. Notice the lighter color.






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