trackway
laelaps | March 23, 2010A comparison of three-dimensional scans of hominin footprints. Top) A footprint made by an experimental subject using a normal, "extended" gait. Middle) A footprint made by an experimental subject using a "bent-knee, bent-hip" gait. Bottom) A Laetoli footprints. From Raichlen et al., 2010.
About 3.6 million years ago, at a spot now in Laetoli, Tanzania, a pair of hominins trudged through the ashfall dumped onto the landscape by a nearby volcano. We don't know for certain what they looked like (it is generally believed that they were Australopithecus afarensis from the presence of fossils…
gregladen | March 10, 2009Dino spoor, that is. A recently reported finding in PLoS ONE clarifies a number of questions about how certain dinosaurs held their front limbs (zombie/Frankenstein-position palm-down vs. huggie-wuggie palms-facing-each-other). This research confirms ...
that early theropods, like later birds, held their palms facing medially, in contrast to ... prints previously attributed to theropods that have forward-pointing digits. Both the symmetrical resting posture and the medially-facing palms therefore evolved by the Early Jurassic, much earlier in the theropod lineage than previously recognized…
laelaps | October 30, 2007The sculpted skull of the AMNH Deinonychus mount.For nearly as long as I can remember, artistic depictions of Deinonychus and related dromeosaurs have featured the dinosaur as a pack hunter, often pouncing on a hapless ornithischian like Tenontosaurus (see here, here, here, and here for examples). After being confronted with such imagery time and time again I didn't think twice about the pack-hunting behavior in Deinonychus as a kid, but I started to wonder on what evidence all these gory illustrations were based. The popular books in my own library treated the behavior as a fact and gave no…