In April, a group of Finnish farmers outfitted a spindly black drone with a remote-controlled chainsaw and filmed it decapitating snowmen. They called it "Killer Drone." More formally, it was a DJI S1000. This spring, marine biologists flew a drone over the Sea of Cortez to capture samples of the fluid sprayed from the blowholes of blue whales. It was a DJI Inspire 1.