Observation recent and ancient tracks
The photo on the right was taken recently. However archaeologists or paleontologists have discovered ancient fossilized tracks. One such set of tracks are described in National Geographic in the article: Incredible details of 10,000-year-old trek revealed in fossil footprints of what is believe to be of a prehistoric traveler who carried a child across a muddy landscape, returning a few hours later empty-handed.
Below are diagrams of even older animal tracks which were discovered. They are presented in in three groups.
Observe each group and infer what might have happened all those years ago.