Cartwheeling snakes and possible dinosaur blood: new insights into locomotion biomechanics and fossil preservation

Overview

The podcast presents two biology focused stories: a dwarf reed snake that performs a rapid, circular flip to escape disturbances, and a fossil from a 115 million year old dinosaur bone showing cell like structures that may be red blood cells. The discussion blends field observations, lab work, and interpretations about how animals move and how delicate tissues survive over deep time.

• Cartwheeling snakes reveal a unique, energy intensive escape motion that may be faster and more confusing to predators than slithering.
• Researchers report hints of fossilized red blood cell like structures inside dinosaur bone with heme evidence, while there is debate about their identity.
• Both stories touch on how morphology and preservation shape what we can know about ancient life and locomotion.

Cartwheeling snakes: a rare rolling locomotion

The podcast opens with a story about a tiny dwarf reed snake, typically under 30 centimeters long and harmless, observed in Malaysia. When disturbed, this snake performs a looping, circular flip that lifts its head off the ground and uses its tail as a pivot to initiate a rapid circular movement. The motion is not a true wheel but a highly coordinated sequence where the body sweeps from belly to back in a repeating cycle. Researchers measured that this maneuver can propel the snake away faster than a straight slither, and they hypothesize that the erratic rolling motion may help predators misjudge the snake’s size or timing, increasing the odds of escape. The researchers emphasize the behavior is constrained by the animal’s morphology, illustrating how behavioral innovation can circumvent the absence of wheels in nature. The discussion highlights how observing such a motion in a small, non venomous species offers insight into locomotor strategies that diverge from typical limb based movement.

Oldest fossilized red blood cells: the dinosaur blood question

The second story shifts to paleobiology, reporting on bone fragments from a dinosaur named Aratosaurus muzi nacionali that survived a catastrophic museum fire in 2018 and was later studied to search for preserved soft tissues. In very thin bone sections, scientists found round, cell like structures with sunken centers that resemble red blood cells. A battery of tests detected heme and degraded heme signatures, which argue for ancient blood related tissue that survived within the bone’s channels that once carried blood vessels. To rule out contamination, the researchers compared outside bone surfaces dominated by chlorophyll containing compounds from the surrounding microbial mat with inside bone segments where heme related molecules dominated. They also observed association with a manganese containing mineral Haussmannites, which may have helped stabilize and preserve these structures. Nevertheless, some scientists question whether these structures are true red blood cells, noting differences such as size and nucleus presence that diverge from modern avian and crocodilian red blood cells. The debate underscores how difficult it is to interpret extremely fragile organics in fossils and how new imaging tools can reveal echoes of ancient biology that bones alone cannot show. The takeaway is that, even with skepticism, there remain exciting possibilities about the information hidden in museum bones and how modern technology can peer inside them to illuminate the lives of long extinct animals.

Broader themes and implications

Together these stories illustrate two broad themes: first, the creative ways organisms move and the role of morphology in enabling novel locomotor strategies; second, the challenges of reconstructing past biology from fossil evidence and how microbial mats and mineralization can complicate or preserve delicate structures. The hosts reflect on how such discoveries expand our understanding of life's diversity and the ways nature solves problems without human like tools. The episode also gestures toward the evolving toolkit of paleobiology, including non destructive imaging methods that enable scientists to glimpse inside fossils without destroying them, and to interpret soft tissues that rarely fossilize. The show closes with a nod to ongoing curiosity and avenues for readers to learn more about these topics through Nature Briefing updates and related coverage.