These complex, looping tracks pressed into ancient seafloor mud look much more like doodles made by a child with a stick than fossils of animal movement. However, new measurements have shown those squiggles were, in fact, purposeful movements along paths made by primitive animals navigating their world almost 550 million years ago, well before textbooks say complex life “took off” …
Read More »Fossil discovery casts fresh doubt on the history of animal evolution
