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					 			      	Pachycephalosaurus - Wikipedia, the free encyclopedia
					 			      	 
					                  	Pachycephalosaurus is a genus of pachycephalosaurid dinosaurs. The type species, P. wyomingensis, is the only known species.
					                  	https://en.wikipedia.org/wiki/Pachycephalosaurus
					 			         
					                  
						          
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					 			      	Pachycephalosauria - Wikipedia, the free encyclopedia
					 			      	 
					                  	Pachycephalosauria is a clade of ornithischian dinosaurs. Genera include Pachycephalosaurus, Stegoceras, Stygimoloch, and Dracorex.
					                  	https://en.wikipedia.org/wiki/Pachycephalosauria
					 			         
					                  
						          
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					 			      	Study Confirms Head-Butting Behavior in Dome-Headed Dinosaurs - Sci-News
					 			      	 
					                  	Dome-headed dinosaurs from the late Cretaceous period known as pachycephalosaurids used domes atop their heads to fight for territory and mates.
					                  	http://www.sci-news.com/paleontology/science-head-butting-dome-headed-dinosaurs-01247.html
					 			         
					                  
						          
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					 			      	Pachycephalosaurus - Prehistoric-Wildlife
					 			      	 
					                  	Facts and information about the dinosaur Pachycephalosaurus and thousands of other prehistoric creatures.
					                  	http://www.prehistoric-wildlife.com/species/p/pachycephalosaurus.html
					 			         
					                  
						          
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					 			      	Pachycephalosaurus Wyomingensis - National Geographic
					 			      	 
					                  	Pachycephalosaurus wyomingensis was the largest of the pachycephalosaurids-"thick-headed dinosaurs"-which featured extremely thick skullcaps.
					                  	http://animals.nationalgeographic.com/animals/prehistoric/pachycephalosaurus-wyomingensis
					 			         
					                  
						          
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					 			      	Pachycephalosaurus - ScienceViews
					 			      	 
					                  	The Pachycephalosaurus had a huge skull plate, providing cushion for its small brain.  The plate was surrounded by small blunt spikes.  It had a small muzzle with a pointed beak and tiny teeth.
					                  	http://scienceviews.com/dinosaurs/pachycephalosaurus.html
					 			         
					                  
						          
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					 			      	10 Bone-Headed Facts About Pachycephalosaurus - Mental Floss
					 			      	 
					                  	Pachycephalosaurus' domed, heavily-built head looks like it was capable inflicting some serious damage. Unfortunately, trying to decipher how this animal used that noggin has given many poor scientists headaches of their own.
					                  	http://mentalfloss.com/article/58415/10-bone-headed-facts-about-pachycephalosaurus
					 			         
					                  
						          
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					 			      	Fossil Testifies to Pachycephalosaurus Pain - Smithsonian
					 			      	 
					                  	A damaged skull throws support to the idea that some dome-headed dinosaurs butted heads
					                  	http://www.smithsonianmag.com/science-nature/fossil-testifies-to-pachycephalosaur-pain-79971905
					 			         
					                  
						          
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					 			      	Pachycephalosaurus - DinosaurFacts
					 			      	 
					                  	Information on the Pachycephalosaurus including pictures, facts, and a short biography.
					                  	http://www.dinosaurfacts.org/pachycephalosaurus
					 			         
					                  
						          
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					 			      	Pachycephalosaurus - About
					 			      	 
					                  	The plant-eating dinosaur Pachycephalosaurus gave new meaning to the word "blockhead."
					                  	http://dinosaurs.about.com/od/herbivorousdinosaurs/p/pachycephalo.htm