This video from the USA says about itself:
Timber Rattlesnake Staring Contest
13 December 2016
Yellow phase Timber Rattlesnake or Canebrake (Crotalus horridus) is potentially the most dangerous of the venomous snakes in the United States, but fortunately has a relatively mild-mannered disposition. Unless you are so unlucky as to step directly on one hidden in tall grass for example, they generally give lots of warning and will either freeze or retreat rather than striking out unless they are unduly provoked.