Sloths: how did two different animals wind up looking so similar?

Image Credit - Flickr/Harry and Rowena Kennedy CC BY-NC-ND 4.0/ CC BY 3.0

Sloths and guppies appear to have little in common – one is an arboreal mammal living in the slow lane, while the other is a tiny tropical fish with a frantic existence. Yet both could hold the key to better understanding a fundamental process of evolution. Hanging lazily from tree branches where they barely move … Read more

New clues unearthed about mammals’ rapid evolution after dinosaur extinction

The extinction of the dinosaurs paved the way for today's mammalian diversity.

It was a life-altering event. Around 66 million years ago, at the end of the Cretaceous period, an asteroid struck the Earth, triggering a mass extinction that killed off the dinosaurs and some 75% of all species. Somehow mammals survived, thrived, and became dominant across the planet. Now we have new clues about how that … Read more

Genetic error led humans to evolve bigger, but more vulnerable, brains

The skull of a Australopithecus sediba, a species of Australopithecines, who were our ancestors and whose brains started to grow two to three million years ago. Image credit - Australopithecus sediba by Brett Eloff, courtesy Profberger and Wits University is licensed under CC BY-SA 4.0

Newly-discovered genes that helped supersize human brains along with DNA retrieved from extinct humans, which can still be found in people living today, are expanding scientists’ understanding of how our species evolved. One of the major features that distinguish humans from other primates is the size of our brains, which underwent rapid evolution from about … Read more

Could symbiotic microbes help ecosystems survive global warming?

Symbiotic bacteria might have helped coffee plants adapt to climate change in the past.

Studies of the relationships between microbes and the organisms they live on are revealing how plants and animals could adapt to climate change. With the world facing a global warming somewhere between 1 and 5.5 degrees Celsius, organisms that have evolved to thrive in specific environments need to adapt or they could struggle to survive. Our … Read more

Study of DNA flags could reignite centuries-old evolution debate

Charles Darwin (left) and Jean-Baptiste Lamarck (right) are the faces of the earliest debate about evolutionary research.

Evolution could be partly based on environmental adaptation and not just random mutations, re-opening a centuries-old debate between Charles Darwin and Jean-Baptiste Lamarck, according to Professor Thomas Carell from Ludwig Maximilian University in Munich, Germany. He studies the way our genes are switched on and off over our lifetimes – a process known as epigenetics. How has … Read more