Crotalus horridus: By virtue of their large size, timber rattlers are the most dangerous snakes in northeastern America. Fortunately, when encountered most timber rattlers are mild in disposition unless aroused, and make little attempt to rattle or strike. It is believed to have occured in at least 25 counties prior to 1800. Today, the timber rattlesnake is listed as an endangered species by the Ohio Division of Wildlife and is known from only seven Ohio counties.
