id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
iguana-17483	Barbour, Thomas	Protective Devices of Snakes: Rattlesnakes	2005	1	.pdf	application/pdf	750	38	76	The rattle of the rattlesnake (all members of the genera Crotalus, with small scales on the head, and Sistrurus, with large plates on the head, are called rattlesnakes) is more or less familiar to every one. However, when we consider the habit, which a vast number of different species of snakes have, of vibrating the tip of the tail when they are excited, together with the fact that the outer horny layer of the skin is shed at frequent intervals, it is not dif- ficult to look back over what have very probably been the steps which led to the formation of the rattle.	cache/iguana-17483.pdf	txt/iguana-17483.txt