In the study, "Haploid facultative parthenogenesis in sunflower sexual reproduction," published in Nature, researchers examined how sunflowers can form haploid seeds without fertilization.

Facultative parthenogenesis, which is what is being seen in these common smooth-hound sharks, allows an animal to reproduce both sexually and asexually, depending on the circumstances.

A Brazilian rainbow boa in England underwent a process of asexual reproduction called parthenogenesis.

A North Carolina stingray's surprise pregnancy is most likely the product of parthenogenesis. National Geographic's Christine Dell'Amore shared the details of how this works.

A stingray in Hendersonville is about to give birth through parthenogenesis, according to expert, who says it's impossible for shark to mate with ray.

In parthenogenesis, a polar body fuses with the unfertilized egg, triggering it to form an embryo. This is different than cloning, Lyons cautions, which would create an exact copy of the mother ray.

A stingray in Hendersonville is about to give birth through parthenogenesis, according to expert, who says it's impossible for shark to mate with ray.

A North Carolina aquarium announced that a stingray who has not been around a male companion in eight years is pregnant. Parthenogenesis, or asexual reproduction, is a rare phenomenon that can ...

An epaulette shark pup that hatched from an apparent parthenogenesis is now on display at Brookfield Zoo, in a Chicago suburb.

The female epaulette shark was never housed with a male shark but produced a fertile egg, apparently via a process known as parthenogenesis.