Helicoprion is an extinct genus of shark-like, cartilaginous fish that lived from the early Permian (~290 m.y. ago) all through to the massive Permian-Triassic extinction episode (roughly 250 m.y. ago.)
For the first time in over one hundred years worldwide tiger numbers have increased, but there are still only 3,900 specimens in the wild.
Drastically reducing body size and, maybe most importantly, lifespan may have been the most important course of action evolution undertook to preserve some species, paleontologists argue.
Europe is likely to lose all its ash trees, the largest-ever survey of the species warns. Plagued by both a fungal disease known as ash-dieback and an invasive species of beetle, the emerald ash borer, the tree might be wiped clean off of the continent.
We judge our planet’s biological past by using geological evidence – fossils. Fossils are the preserved remains or traces of animals, plants, and other organisms from the remote past.
Some 360 million years ago, the oceans were teeming with big fish, some as big as a school bus. Then something terrible happened, the causes of which still escape scientists today: the Hangenberg Event. This was the last peak in a streak of mass extinctions known as the Late Devonian extinction which exterminated 97% of all marine vertebrate species. In the aftermath, it paid to be small a new study suggests. The researchers at University of Pennsylvania found that small fish dominated the ecological niches for nearly 40 million years. This tremendous rebound time is relevant today when overfishing is threatening countless large fish species. Once these disappear, it might be a very long time before we get tuna-sized fish back on our plates.
When we talk about extinction, we tend to think of it in the past-tense, or as something that just kind of happens, far removed from the activities of humankind. So let’s put things in perspective, just so we fully understand the scope of extinction.
The fact that the greatest biodiversity of large mammals we know of today is recorded in Africa is a legacy of past human activity, not climate or environmental phenomena, new study reveals. The paper theorizes at how the world today would look if Homo sapiens had never existed.
In a previous analysis, the researchers from Aarhus Univeristy, Denmark, they showed how the mass extinction of large mammals during the last Ice Age and the subsequent millennia, most notably the late-Quaternary megafauna extinction, is largely explainable by the expansion of modern humans across the world.
The world’s next massive extinction will most likely be caused not by an asteroid impact, volcano activity or alien invasion, but by us humans. A study that looked at the past and present rates of extinction found that plants and animals are going extinct 1,000 times faster than they did before humans walked on Earth’s surface. So, is it clear
Geological evidence indicate that our planet has seen five mass extinction cycles since life first appeared on the planet. While they sound like the kind of cataclysmic events that only beardy men with huge boats survive through (read that in a book once, so it must be true), they are actually an integral part of life. The cycles free up
Long before T-rex claimed the top dog spot among terrestrial predators, a vicious crocodile ancestor that walked on its hind legs was at the top of the food chain during the Triassic. The fossils of the Carnufex carolinensis, also known as the the “Carolina Butcher,” were discovered decades ago in the Pekin Formation, a geological formation in North Carolina’s Chatham County. It was only recently that researchers reanalyzed the fossils and concluded they were dealing with an all new predator that roamed the Earth several million years before dinosaurs were even around.
Life has found our blue gem planet as a welcoming host, but it hasn’t always been all fun and games. To our knowledge, life has gone through five major mass extinctions over the past couple hundred millions of years. During this time countless species and even families were wiped out in a heart beat, but geological time frame standards. When faced with overwhelming odds, nature favors those who can adapt. According to researchers at the University of Gothenburg plants have always been surprisingly resilient to these challenging times, compared to animals. That’s not to say that plants didn’t go extinct as well – sure, countless as well, but others soon filled their space at a much great pace than animals could.
The Permian was a geologic period that ended some 250 million years ago, with the largest extinction our planet has known. Geologists have now found evidence that global acidic rain accentuated or even caused the massive extinction.
In a groundbreaking analysis based on data extracted from hundreds of studies, scientists concluded that humans are on the verge of causing unprecedented and irreparable damage to the ocean environments. The patterns are clear, and extremely worrying, researchers say – but we still have time to act.
This amazing animal is the pig-nosed turtle (Carettochelys insculpta), a native to the freshwater rivers, streams and lagoons of the Northern Territory in Australia and parts of southern New Guinea. With its delicate piggy snout, webbed flippers and beautiful colors, this turtle gives to show yet again why Australia is home to some of the world’s wackiest creatures. And although it
From the tropics to the poles, bird populations all over the world are facing a sharp decline, cornered by climate change and exposure to man-made biochemicals, namely pesticides. According to to BirdLife International, one in eight species (more than 1,300 species) of birds are under serious threat of becoming extinct. The list includes iconic birds of pray and song like eagles, vultures, swifts or swallows, but also seabirds like sandpipers, pelicans or storks.
Once one of Madagascar’s crown inhabitants, the elephant bird (Aepyornis maximus) is considered the largest bird to have ever lived. The first records of the bird are from the 9th century when Saracen and Indian traders visited Madagascar and spoke of legends of the the giant roc (rukh). The elephant bird became rarer and rarer once with the settling of Madagascar’s
The bucardo, a mountain goat perfectly adapted for life in the extreme cold and snow of winter in the Pyrenees, became extinct in 2000. From the last living specimen, a goat called Celia, researchers managed to harvest living cells and store them in liquid nitrogen. Using these cells, Spanish researchers now plan to de-extinct the species by cloning it. This
A recent study has revived an older controversy, after Dartmouth Professor Mukul Sharma and his team reported what they claim is the first conclusive evidence that links an extraterrestrial impact in Canada with the beginning of the Younger Dryas, a period of abrupt climate change that caused major cooling through the Earth. During this time, a number of species became extinct and the human hunger-gatherer
The reemergence of the critically endangered population of Huemul deer (Hippocamelus bisulcus) marks a fantastic achievement by local governments and conservationists worldwide. Brought back from the brink of extinction, when populations measured less than 1% of original numbers, the Huemul populations have not only stabilized – but have started increasing, according to a new study. The south Andean deer, as