In 2014, University of Alberta paleontology student Aaron J. van der Reest discovered an intact troodontid pelvis in Dinosaur Provincial Park, leading him to take a closer look at previously collected troodontid cranial bones from southern Alberta. Many Dinosaur Park troodontid specimens once referred to Troodon have recently been referred to Stenonychosaurus and Latenivenatrix. The specimens now referred to Stenonychosaurus include several frontals (UALVP 5282, TMP 1986.078.0040, TMP 1988.050.0088, TMP 1991.036.0690), a partial dentary (TMP 1982.019.0151), and the distal portion of a left metatarsal III (TMP 1998.068.0090). In the early summer of 2014, van der Reest discovered an intact troodontid pelvis in Dinosaur Provincial Park Formation of southern Alberta. This led to him conducting an in-depth analysis of previously collected troodontid fossils, including skull bones. His research concluded that the Dinosaur Provincial Park fossil record held two genera of troodontid and not one. Discovered in central Montana in 1855, it was among the first dinosaurs found in North America. Its species ranged widely, with fossil remains recovered from as far north as Alaska, and the Judith River formation of Alberta, and as far south as Wyoming and even possibly Texas and New Mexico. [2]

But it’s an enticing thought. Douglas Dixon’s book The New Dinosaurs explores how dinosaurs might have adapted to exploit current evolutionary niches. He anticipates dino whales, dino giraffes…but could there be dino humans?The holotype of Stenonychosaurus inequalis, CMN 8539, is a partial skeleton consisting of six caudal vertebrae, hand bones, the distal end of the left tibia and astragalus, and a complete left foot. A couple of cranial specimens were also referred to the genus: UALVP 52611 (a nearly complete skull roof) and TMP 1986.036.0457 (a partial braincase). Troodon formosus has been found from Mexico all the way to Alaska, spanning a 15 million year period — a fantastic and unlikely feat,” van der Reest said.

Xu X, Tan Q, Sullivan C, Han F, Xiao D (2011) A Short-Armed Troodontid Dinosaur from the Upper Cretaceous of Inner Mongolia and Its Implications for Troodontid Evolution. PLoS ONE 6(9): e22916. doi:10.1371/journal.pone.0022916 Fiorillo, Anthony R. (2008) "On the Occurrence of Exceptionally Large Teeth of Troodon (Dinosauria: Saurischia) from the Late Cretaceous of Northern Alaska" Palaios volume 23 pp.322-328 Varricchio et al. also found evidence for iterative laying, where the adult might lay a pair of eggs every one or two days, and then ensured simultaneous hatching by delaying brooding until all eggs were laid. MOR 363 was found with 22 empty (hatched) eggs, and the embryos found in the eggs of MOR 246 were in very similar states of development, implying that all of the young hatched approximately simultaneously. The embryos had an advanced degree of skeletal development and empty eggs were relatively uncrushed, implying that hatchlings were precocial. The authors estimated 45 to 65 total days of adult nest attendance for laying, brooding, and hatching. [21] Sternberg, C. (1945). "Pachycephalosauridae proposed for domeheaded dinosaurs, Stegoceras lambei n. sp., described". Journal of Paleontology. 19: 534–538.Did Dinosaurs and Pterosaurs 'Glow'? Extinct Archosaurs and the Capacity for Photoluminescent Visual Displays