Size and Weight:
If only Saurornitholestes had been given a manageable name, it might be as popular as its more famous cousin, Velociraptor. Both these dinosaurs were good examples of dromaeosaurs (better known to the general public as raptors), with their slight, agile builds, sharp teeth, relatively large brains, big-clawed hind feet, and (probably) feathers.
Tantalizingly, paleontologists have found a wing bone of the huge pterosaur Quetzalcoatlus with a Saurornitholestes tooth embedded inside it. Since it's unlikely that a 30-pound raptor could have taken down a 200-pound pterosaur all by itself, this can be taken as evidence that either a) Saurornitholestes hunted in packs or b) a lucky Saurornitholestes happened upon an already-dead Quetzalcoatlus and took a bite.