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Meet the "Chicken from Hell," a recently identified bird-like dinosaur that roamed the Dakotas with T. rex 66 million years ago. Credit: Associated Press The beaked dinosaur, Anzu wyliei, is described in the latest issue of the journal PLoS ONE. The dino was tall, measured 11.5 feet long, weighed 500 pounds and had very sharp claws. RELATED: Dinosaur Feathers Found in Amber "It was a giant raptor, but with a chicken-like head and presumably feathers," co-author Emma Schachner of the University of Utah, said in a press release. "The animal stood about 10 feet tall, so it would be scary as well as absurd to encounter." Lead author Matt Lamanna of the Carnegie Museum of Natural History...

A new dinosaur from Portugal is Europe's largest-ever terrestrial predator and was the biggest carnivorous dinosaur of the Jurassic Period, according to paleontologists who studied its remains. Credit: Getty Creative The dinosaur, named Torvosaurus gurneyi, measured close to 33 feet long and weighed over 2,200 pounds, according to a paper in the latest PLoS ONE. The predator was at the top of Europe's terrestrial food chain roughly 150 million years ago. RELATED: Oldest Dinosaur Nursery Found "The fauna of what is now Portugal was extremely diverse in the Late Jurassic," paleontologist Octavio Mateus of the Universidade Nova de Lisboa, and co-author of the study, said in a press release....

WASHINGTON - A 375 million-year-old fossil has shed new light on the theory of evolution, challenging the widespread view that large hind appendages first appeared after vertebrates transitioned from the water to land. Credit: Flickr/Sarah Pierce A report published in the Proceedings of the National Academy of Sciences said the well-preserved pelves and partial pelvic fin of a Tiktaalik roseae -- which looked like a cross between a crocodile and a fish -- indicated that hind legs actually began as hind fins. First discovered in 2004, Tiktaalik roseae are the best-known transitional species which bridged the leap between fish and land-dwelling tetrapods. Studies of the species had...

The Tasmanian tiger was listed as extinct nearly 80 years ago, but now a team of British naturalists are on the prowl to prove that the species is still alive, the Guardian U.K. reports. Thylacinus cynocephalus. Credit: Wikimedia Properly named a thylacine, the "Tassie tiger" is the largest known carnivorous marsupial of modern times. The stripes on its back resemble those of the jungle cat after which it is named. Though the last known thylacine died at Hobart Zoo in Tasmania on Sept. 7, 1936, some believe the animal is alive and well in the island state's remote northwestern region. The British researchers searching for the species are part of the Centre for Fortean Zoology, based in...

The western black rhinoceros, last spotted in 2006, is now officially extinct. According to the Daily Mail U.K., the International Union for Conservation of Nature, the largest conservation network, declared this week that the subspecies is totally wiped out. Credit: Thinkstock Experts say the western black rhino fell victim to poachers and an overall lack of conservation efforts. Conservationists hope that this tragic news encourages people to protect other rhino species in danger of extinction. Both the northern white rhino and Javan rhino are at the brink of disappearing. "In the case of the western black rhino and the northern white rhino the situation could have had very different...