The Word of the Day from The Zombie Cause Dictionary is ELECTRORECEPTERS.
Electrorecepters are nerve endings that can detect slight electromagnetic fields emitted by living organisms. They are common in sting rays, sharks, duck-billed platypus, and zombies. Zombies are the only creatures that are known for electroreception out of the water due to the presence of digital spinnerets. Zombies have a high density of electroreceptoers and digital spinnerets in the fingertips (which is one reason why they frequently walk with arms outstretched). The effective range of electroreception is up to 20 feet.