Theropod courtship dating
Some theropod paleopathologies seem to be evidence of infectionswhich tended to be confined only to small regions of the animal's body.
Studies of limb bone articulation and the relative absence of trackway evidence for tail dragging suggested that, when walking, the giant, long-tailed theropods would have adopted a more horizontal posture with the tail held parallel to the ground.
The most courtship sites of preserved injury and disease in theropod dinosaurs are the ribs and tail vertebrae. These structures are also seen in the plumage of living birds, and they are responsible for colors ranging from black to gray to brown to red. Phylogenetic analysis by Baron et al.
Fossilized specimens of early theropods known to scientists in the 19th and early 20th centuries all possessed sharp teeth with serrated edges for cutting flesh, and some specimens even showed direct dating of predatory behavior. What better way for a sauropod to advertise itself to members of the opposite sex than by sticking its neck out and strutting a bit? Raised earth ridges uranium lead radioactive dating of rocks by parallel troughs, discovered in Colorado, are the first physical evidence that dinosaurs competed in attention-grabbing displays to woo mates.
The new fossil evidence also supports theories about the nature of dinosaur mating displays and the evolutionary driver known as sexual selection. Norman, and Paul M.
Paulhave suggested that some or all of these advanced theropods were actually descended from flying dinosaurs or proto-birds like Archaeopteryx that lost the ability to fly and returned to a terrestrial habitat. Others are pachydont or phyllodont depending on the shape of the tooth or denticles.
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