Not only is Anchiornis the smallest troodont, it's also the smallest dinosaurs ever. This animal was less than 1 foot in length and weighed an estimated 3-5 ounces. Anchiornis is one of the most bird-like dinosaurs yet to be discovered. The fossil of this dinosaur was so well preserved, scientists were able to get a basic idea of what color it was. Anchiornis lived in Asia about 160 million years ago.