Spiders extend their legs partly by hydraulic pressure rather than by using opposing muscle pairs at every joint. Rice engineers realized that this mechanism could remain mechanically accessible after a wolf spider died. By inserting a small needle into the body and applying a controlled puff of air, they opened the legs; releasing pressure allowed them to close around an object.

The team called the approach “necrobotics”: using biological material that already contains an intricately assembled mechanical system. The deceased-spider gripper could pick up irregular objects, manipulate small components, and lift more than its own weight. Tests also examined repeated opening and closing, while surface coatings were explored as a way to slow dehydration and extend useful life.

This was an early laboratory experiment, not a proposal for general-purpose spider machinery. The animals were deceased, and the interesting part is mechanical rather than gory. Instead of manufacturing tiny articulated joints from scratch, the researchers asked what a natural structure could still do when connected to a simple pneumatic line. One breath of air reopened eight ready-made fingers.