The images are from a National Geographic Documentary called "Extraordinary Animals in the Womb" and were captured by using a combination of three-dimensional ultrasound scans, computer graphics, and small cameras to document the animals’ development from conception to birth. The documentary serves as "testimony to the strong relatedness of all mammals."

1. Elephant

2. Dolphin

3. Chihuahua

4. Cheetah

5. Penguin Peep

6. Tiger Shark

7. Snake

8. Opossum

9. Lemon Shark

10. Polar Bears

Source : listverse