Researchers from the Nanjing Institute of Geology and Palaeontology of the Chinese Academy of Sciences conducted a study on the Shibantan Biota, a treasure trove of ancient fossils in Hubei. This fossil biota dates back approximately 550 to 543 million years. They identified several types of burrows made by worm-like animals, indicating that complex animal behaviours were already shaping the seafloor environment nearly 10 million years earlier than previously thought.