Dinosaurs are Mesozoic superstars. The largest literally overshadowed other forms of life during their prehistoric heyday, and even now they attract far more attention than any other group of ancient organisms. It’s easy to forget the diverse and disparate species that wove together the ecology that helped support the dinosaurs we are so enchanted by.

This is especially true of the Late Jurassic Morrison Formation. These rocks yielded some of the first dinosaurian superstars – Diplodocus, Stegosaurus, Allosaurus, Ceratosaurus, and more – but in 1987 paleontologist George Callison wanted to remind his colleagues that there was an entire array of “wee fossils” that were often forgotten about. In a paper published by the Museum of Western Colorado in Fruita, Callison highlighted