English: Maps of caenagnathid occurrences. Map (A) of North America, showing provinces and states from which caenagnathids have been collected (highlighted in yellow), and formations where caenagnathids are known to occur. Names and horizons are provided for caenagnathids for which mandibular material has been found. Map (B) of Dinosaur Provincial Park in Alberta, Canada (highlighted in green), showing locations of notable caenagnathid specimens. The regions that produced the holotypes of each species are highlighted in blue; the exact quarry of only one of these (Caenagnathus collinsi) is known with certainty (blue dot). Map (C) of western Asia, showing countries where caenagnathids have been found (highlighted), with names and horizons of named taxa. Abbreviations: 1, Scollard Formation (Maastrichtian); 2, Horseshoe Canyon Formation (Campanian-Maastrichtian), 3, Dinosaur Park Formation (Campanian); 4, Frenchman Formation (Maastrichtian), 5, Hell Creek Formation, Northern Montana (Maastrichtian); 6, Cloverly Formation (Aptian-Albian); 7, Hell Creek Formation, Eastern Montana (Maastrichtian); 8, Hell Creek Formation, North and South Dakota (Maastrichtian); 9, Kaiparowitz Formation (Campanian); 10, Ojo Alamo Formation (Maastrichtian); 11, Aguja Formation (Campanian). Modified from Funston et al. (2019a, b).