Sinornithosaurus, a feathered four-winged avian dinosaur discovered in China ten years ago, has been determined to have venomous fangs, making them much like feathered snakes. Recently discovered fossils show grooved back fangs that would have injected venom into prey to paralyze it, along with forward teeth that it used to strip feathers from its prey. A University of Kansas researcher who helped find it said the teeth make it look a lot like a sabertoothed bird.
Chicago Tribune story.
Guardian UK story.