Bird-like dinosaur forces rethink
A rooster-sized dinosaur with a long, slender snout and wing-like limbs is forcing a rethink on bird evolution. The 90 million-year-old reptile belongs to the same sickle-clawed group of dinosaurs as Velociraptor and feathered dinosaurs from China. Buitreraptor gonzalezorum, from the Neuquen Basin in central Argentina may provide tantalising evidence that powered flight evolved twice.
See also, BBC: Plesiosaur bottom-feeding shown.