Insects and Arachnids Are there ants that explode? Do scorpions glow under UV light? Do all spiders spin a web? Find out if you're right! True or False? - Insects and Arachnids The Sahara Desert ant counts its steps. Scorpions glow under ultraviolet light. All spiders make webs. Some ants explode to fight off attackers. The 24-hour ant has a venom that hurts for 24 hours. Tarantulas can kill people. See all "True or False?" quizzes!