Last month's picture was that of a frill-necked lizard. This month we have the skull of a triceratops, a genus of dinosaurs that had 3 horns and a large bony frill. In nature, frills come in two types: bony and cartilaginous. Today bony frills are found in horned lizards. The usage of frills in dinosaurs is poorly understood but it may have been used for thermoregulation or for defense. It is suspected that during territorial fights, triceratops may have used their bony neck frills as shields. There were other dinosaurs with similar large bony neck frills. What a sight it would have been to see these frilled dinosaurs roaming in the wild!
By Marsh, O.C. (1896). "The dinosaurs of North America." Sixteenth Annual Report of the United States Geological Survey, pp. 133-244. Washington: Government Printing Office, 1896. - http://www.lindahall.org/events_exhib/exhibit /exhibits/dino/mar1896.shtml, Public Domain, https://commons.wikimedia.org/w/index.php?curid=514745