Penguin 1. Inside the bird egg. This Penguin foetus is resting on the yolk sac, which fills most of the egg at this stage. The chorionic membarne can be seen attached to the shell in the background.
Penguin 1. Inside the bird egg. This Penguin foetus is resting on the yolk sac, which fills most of the egg at this stage. The chorionic membarne can be seen attached to the shell in the background.