Yes, all scorpions are venomous, but not all species of scorpions can cause extreme harm to humans. There's a wide range of toxicity in the venom of various scorpion species, from mild to deadly. Only about 35 of the 2,000 different scorpion species worldwide have venom with the strength to kill a human. Since it takes experience to know which types pose the greatest danger, it's best to avoid contact with any scorpion you encounter.