Wolf spiders are not closely related to the theraphosid spiders we know as tarantulas. Some tarantulas grow as large as dinner plates. Tarantulas do not spin webs typical of many spiders, instead, they live in burrows. They are ambush predators who lie in wait for prey to come within their reach. They hunt using sensory organs on their legs to detect the vibrations of moving prey.
Tarantulas inject their venom using fangs located on their chelicerea.
Their venom pre-digests their prey allowing them to drink their meal with their mouth parts. Tarantula venom is not lethal to humans, but allergic reactions may cause life-threatening problems. Tarantulas utilize their venom as a secondary line of defense against predators. Many species possess urtricating hairs that work like porcupine quills to be thrown at predators. The term urtricating means irritating or inflaming.