Sonny is apprehended, and Spooner is allowed to interrogate him by Lt. John Bergin.
* "T. albertensis" (C. M. Sternberg, 1949)* "T. alticornis" (Marsh, 1887 (izvirno "Bison"))* "T. eurycephalus" (Schlaikjer, 1935)* "T. galeus" (Marsh, 1889)* "T. ingens" (Lull, 1915)* "T. maximus" (Brown, 1933)* "T. sulcatus" (Marsh, 1890)=== Napačno določeni ===* "T. brevicornus" (Hatcher, 1905) (="T. prorsus")* "T. calicornus" (Marsh, 1898) (="T. horridus")* "T. elatus" (Marsh, 1891) (="T. horridus")* "T. flabellatus" (Marsh, 1889) (="T. horridus")* "T. hatcheri" (Lull, 1907) (="Diceratops hatcheri")* "T. mortuarius" (Cope, 1874) ("nomen dubium"; izvirno "Polyonax"; ="Polyonax mortuarius")* "T. obtusus" (Marsh, 1898) (="T. horridus")* "T. serratus" (Marsh, 1890) (="T. horridus")* "T. sylvestris" (Cope, 1872) ("nomen dubium"; izvirno "Agathaumas sylvestris")== Paleobiologija ==Čeprav se triceratopse običajno upodablja kot čredne živali, ni nobenega trdnega dokaza, da so zares živeli v čredah.