Leaping Laelaps by Charles R. Knight
Inspired by this post. This painting was done before the dinosaur-bird connection was irrefutable. In fact, it was done before Dinosaurs were confirmed to be basically “Warm Blooded”. Charles R. Knight did modern dinosaurs in function, if not form, a hundred years before anyone else. Thanks in part to lessons by (in)famous paleontologist Edward Drinker Cope.
Here we see Northeastern Cretaceous therapod dinosaur (and later confirmed to be Tyrannosaurid) Dryptosaurus. Cope found it and named it Laelaps. But his rival, O.C. Marsh pointed out that the name of the genus was already in use by a type of spider. So Marsh gave it a name and that one stuck. Just another part of their infamous rivalry.