Updated

Updated · Mirage News · Oct 26

Tel Aviv University Finds 99-Million-Year-Old Lizard Tail, Confirming Ancient Escape Tactic

Updated

Updated · Mirage News · Oct 26

Tel Aviv University Finds 99-Million-Year-Old Lizard Tail, Confirming Ancient Escape Tactic

Q: Did this ancient reptile sacrifice its tail to survive a predator's bite, or was it a tragic attempt to escape sticky amber?

Scientists cannot tell which happened. The fossil shows that the lizard intentionally shed its tail, but it does not preserve the cause or the animal’s fate. What the amber does reveal is unusually strong evidence for voluntary tail loss, or caudal autotomy. Micro-CT scans showed a clean, symmetrical break and a wedge-shaped ring of muscle tissue consistent with the myoseptal contraction ring seen in modern lizards when they self-detach their tails. Researchers said those features rule out an ordinary traumatic break from crushing, tearing, or a simple bite. That still leaves two plausible scenarios. The lizard may have dropped its tail during a predator attack, using the detached, twitching tail as a distraction while escaping. Or it may have become stuck in sticky tree resin and shed the tail in an attempt to free itself, leaving the severed tail trapped in amber. The specimen therefore answers one question clearly and leaves another unresolved. It is the oldest direct fossil evidence that lizards were already using this escape mechanism about 99 million years ago in Cretaceous forests. But because only the tail was preserved, with no predator, no full body, and no follow-up evidence of survival, researchers say the amber captured the mechanism of escape, not the outcome.

3 articles · Updated · Mirage News · Oct 26

An 18-millimeter amber piece from northern Myanmar preserved a lizard tail that detached about 99 million years ago, giving researchers the clearest direct fossil evidence yet of tail-shedding.
Micro-CT scans revealed a clean, symmetrical break and a ring of tissue like those in modern lizards that deliberately shed their tails, distinguishing it from accidental injury.
Earlier fossils had shown fracture planes or regrown tails, but those clues only implied the ability; this specimen captures an actual autotomy event.
The tail alone cannot identify the lizard precisely or show whether it escaped resin or a predator, but it demonstrates that the defense mechanism was already in use in the Cretaceous.