Did this feathered dinosaur hunt with a lethal, venomous bite?
In short: A small, feathered predator known as Sinornithosaurus may have possessed a deadly secret. Recent studies of its well-preserved skull reveal specialized grooves and hollows that suggest it could deliver venom, potentially rewriting what we know about the evolutionary origins of toxicity in the lineage leading to birds.
Sinornotrhosaurus, a small dromaeosaurid—or 'raptor'—is an early, distant relative of modern birds. Recent fossil evidence suggests this predator was not only capable of hunting at night but may have also been venomous. A narrow channel extends from the tooth's base to its point, accompanied by tiny depressions atop every tooth, according to a team headed by Enpu Gong of the Chinese Academy of Sciences. These structures likely functioned as a delivery tube and nearby storage areas to move venom from glands towards the target.
The evidence for venom extends beyond the teeth. Gong’s team identified small hollows on the side of the jawbone that could have housed venom glands. These structures are remarkably similar to the fangs found in back-fanged snakes, such as boomslangs and vine snakes. The upper teeth are particularly long and fang-like, giving the animal a saber-toothed appearance. If correct, this discovery implies that venom might be a primitive trait within archosaurs, a group that includes dinosaurs, pterosaurs, crocodiles, and birds.
However, the scientific community remains divided. While some experts, such as Bryan Fry, describe the evidence as 'incontrovertible,' others urge caution. Paleontologists like Brian Switek and Thomas Holtz Jr. argue that the evidence is weak, noting that grooved teeth alone do not prove venom delivery and could serve other biological functions. While the presence of these features is a significant observation, the debate over whether this 'Chinese bird-lizard' truly possessed a poisonous bite continues.
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Sources
- Summary by Intellect · source: Sinornithosaurus: A poisonous bite | deadly day or night | Planet Dinosaur | BBC
- Also: Groovy teeth, but was Sinornithosaurus a venomous dinosaur?
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