Do you see them? Copperhead snake in the first photo, Eastern Diamondback Rattlesnakes in the second and third photos. Not my photos.
These are the only truly venomous snakes we have in Maryland and Virginia, and the Copperhead is over-rated for toxin, while the Eastern Diamondback Rattlesnake is rare and generally confined to rocky mountainous areas. Both are found in my immediate area, however; copperheads all over, and rattlesnakes in the high rock just 8 miles out of town.