Crows are members of the Corvidae family, which also includes ravens, magpies, and blue jays. Loud, rambunctious, and very intelligent, crows are most often associated with a long history of fear and loathing. They are considered pests by farmers trying to protect their crops and seedlings. Many people fear them simply because of their black feathers, which are often associating them with death.
Modern Infrared Search and Track systems can search, track and target an enemy aircraft while having a better ability to differentiate discreet aircraft in formations and intermediate ranges than many traditional fighter radar systems fielded today.
Bookmark with: The three most common motion sensors used in technology today are PIR, Ultrasonic and Radar. Ultrasonic uses sound to detect motion and Radar detects pulses. The third, most commonly used, (and also used in our Mr. Beams Motion Sensing LEDs) is PIR motion sensors, which detect heat. If you live almost anywhere in the US, it's likely you have experienced major heat waves this summer and a few may notice a slight change in the range of your Mr. Beams Motion Sensor Light.