Animal virgin births — aka parthenogenesis Parthenogenesis is a term scientists use to describe virgin births among animals, according to National Geographic.

Human-animal chimeras are also produced by introducing human stem cells into animals during various developmental stages, be it embryonic, fetal or postnatal (after birth), according to a 2007 ...

And other animals may give birth to identical twins at higher rates than humans realize. "If a sheep has twin males or twin females, we don't go and test them to see if they're identical," Long said.

A scientist believes he's close to perfecting the necessary technology to clone a Neanderthal — all he needs is a human woman to gestate it.

The human genome is made up of 3 billion building blocks called DNA nucleotides, and changing just one of these can cause devastating birth defects.

Our dream is to create a chimera by injecting human stem cells into carefully prepared animal embryos so that when they become fully grown, they contain some organs made up of human cells.

The gene responsible for sperm in all sexual creatures dates to the beginning of animal evolution—and may be a key to the elusive male birth control pill, a new study says.