Sinosauropteryx was about 3¼ to 4 feet (1 to 1.2 meters) long - most of its length being taken up by its extremely long tail. It is estimated to have weighed around 5½ pounds (2.5 kilograms).
Fossils of Sinosauropteryx show had a covering of what look like down-like feathers. The usual interpretation is that these are indeed primitive feathers with a very simple structure, however an alternative interpretation has also been proposed - that they are the remains of collagen fibers. It has been noted that patches appear on the sides of the body, back, neck skull, arms, leg, and the top and bottom of the tail, suggesting that the animal was completely covered with these "feathers" in life. On the tail, there are also a series of lighter and darker bands, which may be the remains of melanin, and thus give an indication of the animal's living appearance.
We also have some direct evidence of Sinosauropteryx's diet. One fossil specimen shows the remains of a lizard in its stomach. A second fossil, which is also believed to be Sinosauropteryx, was found to contain the remains of the jawbones of three small mammals, two of the jaws being from Zhangheotherium (a Symmetrodont - an extinct order of primitive mammals), and the other one being from Sinobaatar (a Multituberculate - another extinct order of mammals).
Finally we also some information about the reproduction of Sinosauropteryx. The fossil which had a lizard as part of its preserved stomach content, also contained a number of eggs (two of which can be clearly seen). It is not thought that these are eggs that the animal ate (because they are in the wrong part of the body), but rather they are thought to be the animal's own unlaid eggs. Each egg is about 1 inch (25 millimeters) wide, and just under 1½ inches (38 millimeters) long.
Sinosauropteryx was a carnivore (meat-eater) that lived from 125 to 122 million years ago
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