Advanced ultrasound technology is used to trace fetal development of various animals from conception to birth. Included: sharks; emperor penguins; red kangaroos; and parasitic wasps.

The in-utero journeys of a house cat and a lion are observed.

Chronicling the fetal development of wolves and dogs. Included: a look inside the wombs of a mastiff, a golden retriever and a Chihuahua.

Twin fetal development is chronicled, using advanced ultrasound technology. Also: a look the influence genes have on personalities, sexual preferences and other characteristics.

Following the fetal development and interaction of twins, triplets and quadruplets with 4-D ultrasonography and other fetal-imaging techniques.

Advanced ultrasound technology is used to trace fetal development of elephants, dolphins and dogs from conception to birth.

Studying human fetal development via ultrasound technology. Also: a fetoscope procedure is performed to correct a life-threatening condition.