Roadrunnersaurus

The interpretations assigned to this new dinosaur find seem more speculative than usual, although that's likely due to the incompleteness of the fossil find. Still, Xixianykus zhangi was apparently a speedy little bugger. He was a tiny (maybe half a meter long) Late Cretaceous member of the alvarezsaurs, the same group that included Tyrannosaurus and Velociraptor. The structure of Xixianykus' hind legs, with its disproportionately short femur in comparison to the bones of the lower leg, suggests that it was ideally built for a cursorial lifestyle. Surprisingly, this is also in keeping with its likely feeding behavior. Unlike their larger and more famous cousins, Xixianykus didn't feed on giant herbivores or misbehaving genetic engineers - in fact, they probably craved termites. While we don't know anything about the forelimbs of X. zhangi, those parts have not been recovered, similar species are in possession of short, strong arms with a single large claw. Based on similar structures we see in extant animals, paleontologists believe that these little dinosaurs used their long claw to tear open logs and nests in search of their insect prey. The researchers also feel that a termite-feeding lifestyle is in keeping with Xixianykus' built-for-speed body. Living termite-feeders often have to make long treks between meals - the ability to move quickly would shorten travel time and also lessen the likelihood of falling victim to one of their larger cousins during the trip.

Here's the paper, in Zootaxa.