12. Weather Radar
A new, unusual way of monitoring bird behavior is weather radar. Scientists track how clouds move across the state, and with this technology, they can also trace patterns of other large masses like flocks of birds. In addition to seeing how the weather will be on any given day, we can also see what birds will be flying in the sky.
With weather radar, a Doppler Radar sends our radio waves. These waves bounce off raindrops as well as birds; then they return a signal to the Doppler Radar. To distinguish whether what is presented on the map is a flock of birds or something else, experts look for growing concentric circles at certain times of the day like sunset and sunrise. With this method, researchers found a 14 percent drop in bird migration over the course of a decade.