Really old footprints found in Argentina

Argentine paleontologists have found bird-like footprints 55 million years older than the oldest known bird fossils.

The team discovered dozens of three-toed footprints in rocks older than 212 million years in northwest Argentina. Averaging about 3.5 centimeters wide and similar in length, they look very much like bird footprints made in small shallow ponds along a river. However, the rocks are some 55 million years older than the most ancient known bird skeleton, Archaeopteryx. The big question is what made them.

More details here and particularly here.