Canadian fossils reveal 567-million-year-old animals with surprising behaviors

In the remote Mackenzie Mountains of Canada's Northwest Territories, paleontologists have uncovered more than a hundred fossils from rocks laid down roughly 567 million years ago—a discovery that pushes back the timeline of animal behavior by millions of years and complicates what we thought we knew about the earliest complex life on Earth.

These specimens come from the Ediacaran period, a time when the planet's oceans were populated by creatures that bear almost no resemblance to anything alive today. What makes this Canadian site extraordinary is not just the number of fossils preserved there, but their age relative to similar organisms found elsewhere. The specimens are estimated to be between 5 and 10 million years older than comparable examples from other parts of the world, suggesting that the behaviors and body structures we associate with active animal life emerged far earlier than previously recognized. The site has also yielded six groups of organisms never before documented in North America, expanding the geographic footprint of Ediacaran life and challenging assumptions about where these creatures lived.

Among the most striking finds is Dickinsonia, a flat, segmented organism that at first glance seems utterly alien. Yet the fossil record tells a surprising story about how it lived. Dickinsonia appears to have lacked a conventional mouth and digestive system entirely. Instead, researchers have interpreted the evidence to suggest it fed through its lower surface, drawing nutrients directly from the microbial mats that carpeted the ancient seafloor. Chains of feeding traces preserved in the rock indicate that Dickinsonia did not simply sit in one place—it moved from location to location, grazing as it went. Some studies propose that muscular contractions allowed the creature to glide across the microbial landscape, a form of locomotion that would have required coordination and energy expenditure. The fossil traces are valuable precisely because they preserve behavior as well as anatomy, offering a window into how these organisms actually interacted with their environment rather than merely what they looked like.

Another significant discovery is Kimberella, an organism associated with early active movement and a more recognizable body structure. Kimberella is thought to be an early relative of mollusks, distinguished by a muscular foot and feeding apparatus adapted to scraping material from the seafloor. Together, Dickinsonia and Kimberella demonstrate that bilateral body organization—the arrangement of features along a central axis—was already present in the Ediacaran. This matters because bilateral animals eventually diversified into most of the major animal groups alive today. Finding evidence of these fundamental characteristics deeper in geological time helps scientists pinpoint when crucial evolutionary innovations first appeared.

The fossil assemblage also includes Funisia, a tube-shaped organism that was not mobile but lived in dense clusters. Researchers interpret these clustered arrangements as potential evidence of early sexual reproduction, possibly involving the coordinated release of reproductive cells into the seawater. If this interpretation is correct, the fossils offer an extraordinarily ancient glimpse into reproductive behavior—a dimension of life that rarely leaves any trace in the fossil record at all. Combined with the evidence for movement and feeding in other organisms, the Canadian site paints a picture of an Ediacaran seafloor that was far from passive. Instead, it was inhabited by creatures with distinct lifestyles, different feeding strategies, and varied reproductive approaches.

Perhaps equally surprising is the setting in which these fossils were found. Most known Ediacaran communities come from relatively shallow marine environments, but the Canadian specimens were preserved in rocks representing an ancient continental slope—a deep-water setting. This raises fundamental questions about where early animal innovations actually originated. It is possible that deep marine environments provided stable conditions in which some early organisms could develop and diversify before spreading to other habitats. The discovery does not prove that all early animals originated in the deep ocean, but it expands the range of environments scientists must now consider when investigating the origins of complex animal life.

The preservation of these fossils depended on exceptional geological circumstances. Soft-bodied organisms like these leave no shells, bones, or other durable structures. Their survival in the rock record required rapid burial and careful entombment in sediment—conditions that are rare but not impossible. The Canadian site demonstrates how a remote location can fundamentally alter our understanding of evolution. The fossils show that 567 million years ago, the seafloor was already home to organisms capable of moving, feeding, and reproducing in surprisingly sophisticated ways. These discoveries push the story of animal movement deeper into Earth's past and add another extraordinary chapter to the long evolutionary journey that eventually produced the animal world we inhabit today.