Scientists have used 3D scanning to identify the earliest animal with a front, a back, two symmetrical sides and openings at both ends connected to one another by a gut.
Scientists described how some species of toad choose to mate with males of a different species, showing that females can place sexual pressure on another species for the first time.
More than a century ago, Darwin reasoned genera with more species would contain more variation within those species.
The extinct animal may reveal how modern birds survived the asteroid that wiped out large dinosaurs.
"[The discovery] shows that some of the big steps in evolution we thought were restricted to land animals actually first took place in fishes," said researcher John Long.
The march of progress is the idea that evolution always results in increased complexity.
Facivermis is a rare animal that evolved to become more primitive, loosing its back limbs when they were no longer useful.
Scientists hope the remains will offer new clues about the emergence of photosynthesising green plants.
Symbolism has been an important part of human society since prehistoric times. Scientists show that engravings become more salient, more memorable and easier to reproduce over time.
New research adds weight to the idea that people became less hairy via sexual selection, with results suggesting women with higher levels of disgust prefer clean-shaven men.
Researchers identified digestive tracts in an extinct worm-like creature known as Cloudina.
"Viruses, like all organisms, adapt and evolve," co-author Joel Wertheim told Newsweek.
Oreopithecus bambolii lived in what is now Italy between 8.3 and 6.7 million years ago.
Researchers analyzing the perplexing behavior say it appears to be some form of communication.
Scientists identified more than 40 new species of cichlid fish in Lake Mweru, East
The swarm of male shrimp were killed in a "mass mortality" event during the time of the dinosaurs.
Traditionally, scientists thought Australopithecus' larger brain size meant it was smarter than modern great apes, but new research suggests that assumption is wrong.
New discoveries in Bavaria of an ape with "orangutan arms" but human-like legs has the science community excited about connecting the dots of evolution between great apes and humans.
Researchers say their findings represent some of the first evidence that evolutionary changes are affecting the time of year that wild animals give birth.
The amount of food people eat tends to be profoundly influenced by evolutionary psychology, a study led by researchers from the University of Birmingham found.
Human's evolved through a series of highly unlikely events—so finding another intelligence like us would be like winning the lottery many times over.
Computer simulation shows 300,000 years is more than enough time for a new human species to arise.
The dinosaur could bite with about three times the force of large crocodiles or great white sharks.
"it's never been proven," said Brainerd School District chair Sue Kern. "So I'm wondering why we're still teaching it."
Short-faced kangaroos are an entirely extinct group of marsupial herbivores that arose during the Miocene Epoch—around 23 to 5.3 million years ago—and diversified prolifically during Australia's Ice Age.
The discovery of Yilingia spiciformis provides insight into a key moment in the evolution of life on Earth
Hydrophis cyanocinctus has managed to evolve a respiratory system that works in much the same way as gills
Skull discovered in a cave in Southern Greece has been identified as Homo sapiens.