Fact, this snake, be it king snake or black snake, whatever, rattles it's tail like a rattlesnake to fend off predators, the rapid movement of the tail in leaves mimics the sound. :
North American Racer – Florida Snake ID Guide
Snakes of South Carolina | South Carolina Partners in Amphibian and Reptile Conservation
Naturally New England: Rattle and Kink
Eastern Ratsnake rattling its tail | Rattling one's tail is one way that snakes express their fear and make themselves appear threatening to predators. This is NOT a technique solely used by...
Black Racer Snake Facts, Habitat, Diet, Adaptation, Pictures
Black-tailed rattlesnakes are a less-known species among most Texans
What type of black snake imitates a rattlesnake and rattles its tail? - Quora
Baby snakes are hard to identify – Benweb 3.3
Imitation rattler | Ohio Cooperative Living
Black Racer Snake - Facts and Beyond | Biology Dictionary
Snake Species Found in the Tucson Area
Is this a baby rattlesnake? : r/snakes
Black Rat Snake - WNC Nature Center
Eastern Ratsnake
Arizona Black Rattlesnake Animal Facts | Crotalus cerberus - AZ Animals
The Difference Between a Black Snake & a Racer | Sciencing
Field Notes: Do black snakes really kill rattlesnakes and copperheads? - GREENVILLE JOURNAL
Snakes of Nebraska | Nebraska Game & Parks Commission
Western Ratsnake | Missouri Department of Conservation
Fox snake | reptile | Britannica
Guide to Snakes in South Carolina Including Poisonous Snakes