Clistopyga wasps lay their precious eggs inside paralyzed spiders. But in case that isn’t enough protection, they’ve found a particularly crafty way to ensure the safety of their offspring, New Scientist reports. They use a needlelike ovipositor (which is also used to deliver venom and lay eggs) to stitch up the spider host in its own silk to protect them from predation and parasitism, as scientists reported yesterday in Biology Letters. When the eggs hatch, the wasp larvae eat the spider while it’s still alive. The researchers say Clistopyga's "sewing technique" could lead to new sewing needles for human use in the textile and medical fields.