|The following is based on Fallout: Brotherhood of Steel 2 and has not been confirmed by canon sources.|
Texas Rattlers are mutant snakes in Texas.
A giant, mutated rattlesnake. The mutation has diluted its poison, making it merely sickening instead of lethal, but it has also made the snake into a giant, monstrous reptile. Coming in at six feet tall (over 180 cm) and with 500 pounds (225 kg) of weight, it doesn't need the bite to kill a full grown man. Although if it does, the six inches of ivory are certain to ruin someone's day.
Texas Rattlers were to appear in the canceled Fallout: Brotherhood of Steel 2.