There are 5 known mass extinctions, the last occurring 65 MYA. Today, we are going through the sixth mass extinction event with roughly 27,000 species lost per year, mostly due to human causation.
Ancient Mammals. Dinosaurs. Pterosaurs. Recent Extinctions (1700 - 2015) Beetle fossils show their colors. The fossils of beetles may open the door to understanding what exactly ancient organisms looked like.
A Tiny Amphibian Trapped in Amber Is a New Species. The only known salamander from the Caribbean is preserved in a drop of golden sap that formed 20 million years ago.
This story ran in the April 2016 issue of National Geographic magazine. More than 20 million years ago a salamander hatchling less than three-quarters of an inch long met a traumatic end. A hungry predator—perhaps a spider or bird or snake—ripped off its left front leg, leaving the stub of a bone jutting from its side. The salamander managed to escape but then must have fallen into a pool of tree resin, which preserved the tiny amphibian as it hardened into amber.
George Poinar, Jr., a biologist at Oregon State University who specializes in amber, believes he collected this specimen in the Dominican Republic years ago without realizing that it was unique. It has since been identified as a new genus, based on visible physical features such as the large webbed front and back feet. . © 1996-2016 National Geographic Society. Buy Tickets. New Cause Behind Three Mysterious Mass Extinctions Revealed. Fossils show sea creature's half-billion-year-old brain. News in Science Thursday, 17 July 2014 Will DunhamReuters.
The Arrival Of Animals Triggered Earth's First Mass Extinction. The first great extinction of life was caused by an evolutionary advance, rather than a catastrophe such as an asteroid strike or supervolcano, evidence from Namibia suggests.
The arrival of animals, with the newfangled advantage called movement, spelled doom for species trapped in one place. For three billion years, the only life on Earth was single-celled microbes. Around 600 million years ago, the first multi-celled organisms, known as the Ediacaran biota, appeared. Sixty million years later, these were followed by the first animals, an evolutionary experiment with a bewildering range of body types known as the Cambrian explosion.
Fossilised bite marks show how ancient reptiles battled across land and water. Sarcosuchus Skull. 7 (Thankfully) Extinct Giant Versions of Modern Animals. The animal kingdom is loaded with some pretty formidable creatures, a few of which we as humans are only barely able to keep in line even with modern technology. As it turns out, many of these species are the diminutive descendents of giants so mind bogglingly huge and terrifying that they could probably take over the entire world with minimal effort. Meganeura, The Giant Dragonfly Meganeura were enormous dragonfly-like insects with wingspans the length of an average toddler, making them among the largest flying predatory insects in the history of the world. Their diet consisted mainly of other insects, small amphibians and the dreams of children. Some scientists think that Meganeura were actually too big to be able to survive in the current atmosphere, citing the higher oxygen concentration in the prehistoric world as the only way an insect its size would be able to breathe in enough to support its massive body.
Why it's a Good Thing They're Dead: Extinction event. The blue graph shows the apparent percentage (not the absolute number) of marine animalgenera becoming extinct during any given time interval.
It does not represent all marine species, just those that are readily fossilized. The labels of the "Big Five" extinction events are clickable hyperlinks; see Extinction event for more details. (source and image info) Since life began on Earth, several major mass extinctions have significantly exceeded the background extinction rate. Arthropleura. Arthropleura (Greek for Jointed Ribs) is a genus of extinct, 0.3–2.6 metre (1–8.5 feet) long arthropods related to modern day centipedes and millipedes, native to the upper Carboniferous (340 to 280 million years ago) of what is now northeastern North America and Scotland.
The larger species of the genera are the largest known land invertebrates of all time, and would have had few, if any predators. Description and behavior Reconstruction of A. armata. Contrary to earlier and popular beliefs, Arthropleura was not a predator but an herbivorous arthropod. The Top 10 Most Amazing Extinct Animals. From the Quagga --half zebra, half horse-- to the Irish Deer --the largest deer that ever lived--, an impressive list with pictures of amazing animals we will never see.
Tyrannosaurus Rex (extinct 65 million years ago) [Wiki] Tyrannosaurus rex was one of the largest land carnivores of all time, measuring up to 43.3 feet long, and 16.6 ft tall, with an estimated mass that goes up to 7 tons. Like other tyrannosaurids, Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Relative to the large and powerful hindlimbs, Tyrannosaurus forelimbs were small and they retained only two digits. List of extinct mammals. A large number of prehistoric mammals are extinct, such as Megafauna.
See List of prehistoric mammals. This is an incomplete list of historically known extinct mammals, their dates of extinction, and former range. Mammals included are organisms which have been described by science, but which have subsequently become extinct. Many of these animals have become extinct as a result of human hunting, for food or sport, or through the destruction of habitat. Marsupials Sirenians Steller's Sea Cow (1768), Commander Islands Rodents Cracked: Bizarre Prehistoric Versions of Modern Animals. Nobody ever cranks out a masterpiece in one sitting.
Not even Mother Nature gets it right the first time. If she did, then the prehistoric ages wouldn't have been filled with stupid and bizarre-looking prototypes of modern species that seemed doomed to fail from the start. Some of evolution's laughable early drafts include ... #7. Platybelodons, aka Elephants With Giant Trunk-Mouths Tomasz Jedrzejowski Who knew that the quickest way to strip an elephant of all its majesty was to replace that dick it carries around on its face with a duck bill? Paleontologists apparently have long-winded arguments on why nature would intentionally make an animal look like that. Extinct Birds. Carolina Parakeet, Gustav Mutzel Once abundant, this extinct species nested in large colonies in the cypress swamps in the South Atlantic and Gulf States.
They migrated up the Mississippi, and Missouri Rivers to the Platte and regularly to Ohio, Indiana, Illinois, Iowa, Wisconsin and Nebraska, and in the east to Pennsylvania.