Cinematic-MRI, a new technique that provides high-clarity images, was used to capture this video of twins battling it out in their mother's womb.
According to Huffington Post, the images will be used by Dr. Marisa Taylor-Clarke of Imperial College's Robert Steiner MR Unit in London. She is studying Twin To Twin Transfusion Syndrome, in which identical twins share a placenta, and blood vessels.
When the condition manifests itself, one baby receives more blood, and develops faster than the other one, stripping him of nutrients.
In fact, it is obvious that one of the fetuses has developed faster, but the smaller twin looks really feisty. He looks like he is pushing his brother away with his feet, trying to make more room in the womb. His brother responds and kicks back, but appears to be more passive.
Last month, a 4-D scan captured images of fetuses yawning. They open their mouths slowly and shut them abruptly, performing a movement which is very similar to the action of yawning.