Scorpions Are Predators With a Sensitive Side | Deep Look

Powerful pincers. Paralyzing venom. Armor fortified with iron and zinc. They're totally metal. The scorpion has a fierce reputation that's lasted through the ages. Its ancestors were some of Earth's earliest predators. But this beast has a secret, a softer side. If you flip over a scorpion, don't try this at home. Its belly is sensitive. And not just because its armor is thinner there. Right behind its legs, you'll see a couple of comb-like organs. These are pectins. And every scorpion has a pair. The comb teeth are covered in tiny sensors called peg sensilla. Every peg sensillum has a slit-shaped pore that takes in chemical traces from the ground and air. Each is attached to roughly a dozen nerve cells. This helps the scorpion's brain read the chemicals to understand its environment. It's similar to how we taste and smell. That's useful, because even though it has many eyes, a scorpion's vision is not the best. When two scorpions meet, they use their pectins to sense each other's pheromones, invisible chemical signals they release into the world around them. This helps them determine who's a menace, a meal, or potential mate. Looks like these two are a match. They're not fighting. They're, well, holding hands and kissing, scorpion-style. And this is their version of a slow dance. The male deposits a packet of sperm on the ground inside a casing called a spermatophore. She picks up what she needs. And just like that, this brief but sweet courtship is over. The peg sensilla are also sensitive to physical cues. They brush the ground as the scorpion walks, deciphering textures that help it navigate. But the pectins aren't its only specialized sensors. The scorpion's dainty feet and hairs all over its body also help it pick up minuscule vibrations. Mmm, dinner. Fossils show scorpions have existed in some form or other since before the dinosaurs. At night, researchers can find scorpions because they glow under a simple UV flashlight. Why this is, is a mystery. Today, there are more than 2,000 species found all over the planet. And scientists are still discovering more. There's so much pressure out there to be tough, smart, fast. Maybe the real trick to survival is cultivating your sensitive side. For hundreds of millions of years. Hey, it's Laura. Need some more arachnids like these scorpions in your life? Thought so. Let's keep things going with this spider playlist. And a special thank you to Chris B. Emrick, whose generous monthly support on Patreon helps make Deep Look possible. If you want to support us on Patreon too, there's a link in the description. Thanks!