In the Womb: Identical Twins (2009), by National Geographic

National Geographic's documentary In the Womb: Identical Twins focuses on the prenatal development of human identical twins. Director Lorne Townend uses three-dimensional (3D) and four-dimensional (4D) ultrasound imaging and microscopy to depict twin development , genetic and epigenetic variations in the fetuses, and methods of fetal survival in the confines of the womb. Artist renditions of scientific data fill in areas of development inaccessible to the imaging tools. The 50-minute film describes the lives twins live after birth and describes new research that identical twins might not be as identical as once thought. In the womb: Identical Twins is a sequel to the 2005 National Geographic film In the Womb.