Sinosauropteryx
"Sinosauropteryx" was a small bipedal theropod, noted for its short arms, large first finger (thumbs), and long tail. The taxon includes some of the smallest known adult non-avian theropod specimens, with the holotype specimen measuring only in length, including the tail. However, this individual was relatively young. The longest known specimen reaches up to in length, with an estimated weight of .
Tylosaurus
Along with plesiosaurs, sharks, fish, and other mosasaurs, "Tylosaurus" was a dominant predator of the Western Interior Seaway during the Late Cretaceous. The genus was among the largest of the mosasaurs (along with "Mosasaurus hoffmannii"), with the possibly conspecific "Hainosaurus bernardi" reaching lengths up to , and "T. pembinensis" reaching comparable sizes. "T. proriger", the largest species of "Tylosaurus", reached lengths of about .