Dramatic 4-D images trace the embryonic and fetal journey of one of nature's most fascinating miracles.
Cats , The Testosterone Effect , The debate over nature versus nurture gets fuzzy when it comes to influences in the womb.
Cats , Mother and Hunter , Female lions must continue to hunt while pregnant, so Mother Nature has designed clever strategies to keep fetuses safe.
Cats , Worse Than Claws , Evolution has played a mean trick on female cats, but they don't seem to mind.
Dogs , One for All , When times are tough, a wolf fetus may make the ultimate sacrifice to ensure its siblings survive.
Dogs , Fuzzy Fetuses , These fetuses are doggone cute!
Extreme Animals , Shooting the Wasp , A short montage of scenes from the shooting of the parasitic wasp story of "In the Womb: Extreme Animals."
Extreme Animals , Animatronic Larvae , A short montage of scenes from the shooting of the parasitic wasp story of "In the Womb: Extreme Animals."
Extreme Animals , In the Roo Pouch , A short montage of scenes from the shooting of the kangaroo story of "In the Womb: Extreme Animals."
Extreme Animals , Body Invaders , A parasitic wasp has injected her eggs into a caterpillar -- and now they're ready to hatch.
Extreme Animals , Breathing Shell , Safe in its egg, a penguin fetus uses a complex and clever adaptation to get oxygen.
Extreme Animals , Kangaroo Kama Sutra , Getting a kangaroo pregnant is no easy task -- just ask some kangaroo sperm.
Extreme Animals , Shark Ultrasound , A short montage of scenes from the shooting of the lemon shark story of "In the Womb: Extreme Animals."
Identical Twins , Becoming Babies , An unprecendented look at the development of twins in utero.
Identical Twins , Twin Identities , Scientific and imaging technologies offer new insights into the lives of twins -- before they're born.
In the Womb , In the Womb , 3-D and 4-D scans reveal fetal development.
In the Womb: Animals , Golden Puppies , They're not old enough to adopt, but these in-utero puppies are already cute enough to make you want one.
In the Womb: Animals , Womb Preview , Learn why dog ears develop so early and acutely.
In the Womb: Animals , Womb Preview , Learn why dog ears develop so early and acutely.
In the Womb: Multiples , Multiples' Womb , Identical twins can each be of a different sex.
![In the Womb: Multiples , Inside the Womb , Images show multiple babies inside the womb.]()
In the Womb: Multiples , Inside the Womb , Images show multiple babies inside the womb.
Cats,A Bengal cat lays down in the grass.
Cats,A Bengal cat lays down in the grass.
Cats,A Bengal cat walks through the grass.
Cats,A juvenile male lion eats a carcass.
Cats,Male lion.
Cats, A pride of lions eat a animal just killed.
Dogs,Mastiff.
Dogs,The gray wolf is the ancestor of today's dogs, an ice age survivor originating around 300,000 years ago. In fact, the wolf was the first animal to be domesticated more than 12,000 years ago.
Dogs,63 days after the eggs were fertilized the mother is ready to give birth. Selective breeding has produced Chihuahuas too small to push out her puppies. Chihuahuas are usually delivered by Caesarean section.
Dogs,Newborn Chihuahua puppies.
Dogs,Pregnant Chihuahua.
Dogs,At 20 days, the Hox genes are starting to activate within the fetus. These genes control the development of the legs, ribs, heads or tails.
Extreme Animals,Model of a late stage emperor penguin embryo in its egg.
Extreme Animals,The kangaroo is one of the most bizarre looking mammals and its reproductive process appears equally peculiar.
Extreme Animals,A ultrasound scanning of a baby lemon shark in Bimini, Bahamas.
Extreme Animals,The kangaroo is one of the most bizarre looking mammals and its reproductive process appears equally peculiar.
Extreme Animals,Models of parasitic wasp larvae growing inside a caterpillar.
Extreme Animals,Newly hatched caterpillars feast on their egg cases.
Identical Twins,Computer generated imagery of DNA double-helix with methylation.
Identical Twins,Black and white twin siblings smiling.
Identical Twins,4D ultrasound taking place. Mother and father to left, sonographer on right.
Identical Twins,Computer generated imagery of DNA with black and white photos.
Identical Twins,Black and white twin siblings smiling.
Identical Twins,Computer generated imagery of sperm approaching unfertilized egg.
In the Womb,Computer generated image of a fetus in the womb.
In the Womb,Computer generated image of a fetus in the womb.
In the Womb,A special ultrasound 3-D camera is prepared to receive images of fetus in the womb.
In the Womb,A pregnant woman rests on a beach overlooking the ocean.
In the Womb,Computer generated image of a fetus in the womb.
In the Womb: Animals,A model of a full-term elephant fetus.
In the Womb: Animals,Elephant Model III - 12 months gestation.
In the Womb: Animals,Close-up of elephant Model IV work in progress—full term fetus.
In the Womb: Animals,Dog fetus at 39 days.
In the Womb: Animals,A model of an elephant fetus after 118 days.
In the Womb: Animals,Elephant Model IV work in progress—full term fetus.
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