Night stalkers are fascinating creatures that wander the Mojave Wasteland. It is a mystery where they came from (at least in the Mojave), but Dr. Borous of Big MT confirms that night stalkers are genetic hybrids of rattlesnakes and coyotes created in the Z-9 Crotalus DNA preservation lab on a dare from Dr. Calis. After escaping the facility and the Big MT crater altogether, they created dens in the many caves of the Mojave Desert. They are particularly dangerous because they travel in packs of up to ten, are quick and have a devastatingly venomous bite. Fortunately, their blood makes up part of an antivenom, which aids in neutralizing their venom.