A study has found that the reason why the evolution of the first animals to appear on Earth was delayed for over 10 million ...

The way that Earth's first animals reproduced held back life's diversity for millions of years, until stress and competition ...

Earth’s earliest animals may have held evolution back because they reproduced asexually, creating low-competition communities ...

Fossils from some of the oldest-known animals on Earth, dating from 574 million years ago (Ediacaran period), suggest that cloning, not competition, dominated the Ediacaran seas, slowing evolution ...

Scientists suggest Earth's earliest animals reproduced asexually, slowing evolution and delaying the biodiversity boom that ...

In the animal kingdom, reproduction is a necessary part of species survival. Parthenogenesis, a form of asexual reproduction where embryos develop from unfertilized eggs, has been observed in captive ...

How do animals decide when to fight and when to walk, fly, slither, or swim away? Most research on animal conflict has focused on the short-term costs of single interactions, but a pair of behavioral ...

Animal reproduction encompasses the full sequence from gamete formation through fertilisation, embryonic development and parturition. In farm and companion species alike, natural breeding is ...

Thanks to a pressurized penis inflator and genitals flown in from across the U.S., an anatomist has answered a long sought-after question: how do the genitals of dolphins and porpoises fit together ...