Secrets of dinosaur gathering revealed by newly discovered footprints / Fossil footprints reveal what may be the oldest known handcarts / Fossil footprints study is the first to track cave bears in the Iberian Peninsula / Ancient footprints show how early human species lived side by side / Two ancient human species once coexisted, reveal fossil footprints / Fossilized footprints reveal two extinct hominin species living side by side 1.5 million years ago / Rare footprints suggest two of our prehistoric ancestors may have met / A fossil first: Scientists find 1.5-million-year-old footprints of two different species of human ancestors at same spot / Fossil finds: Footprints on South Africa's coast offer a glimpse into our ancestors' lives / Ancient people carved mysterious symbols near dinosaur footprints