Anti-poaching teams can only do so much to protect rhinos. Their immediate presence can deter rogue hunters, but a lot of the slaughter happens before these teams even know that something's wrong. That's where non-profit group Protect's RAPID (Real-Time Anti-Poaching Intelligence Device) should come in handy. The system uses a blend of heart rate sensors, GPS tags and cameras drilled into one of the rhinos' horns (don't worry, it's painless) to warn conservationists when a rhino is under threat. If a rhino's heart starts racing or suddenly goes still, observers get an alert that lets them turn on the camera to see if something's wrong. Ideally, this will prevent poachers from even firing a shot -- they know that they'll likely be caught within minutes if they chase or kill a tagged animal.