The radar could probably detect a bird, but there is no indication radar was used in the Go Fast video. Someone speculated that radar was used to determine range, but that has not been confirmed. Which brings up a potential problem with the (impressive) analyses contributed on this thread: Unlike radar which can measure distance to a target by the timed echo, visual and infrared tracking do not provide direct range information. How does real-time range information appear on the display? I suspect that Raytheon engineers generated an algorithm to calculate the apparent range to a visual- or infrared-tracked target by assuming a stationary target and basing the calculation on the aircraft/ATFLIR motion data (translations and rotations), angular direction to the target, and instantaneous slew rates of the camera positioner required to maintain tracking lock. If that’s correct, and if we now use those calculated range values in frame-by-frame trigonometric motion analysis, it’s not surprising that the results indicate the target is nearly stationary. It’s indeed possible that the tracked target in the video is near the indicated distance, at around 13,000 feet altitude, moving relatively slowly. But if the target is actually in motion, the fixed target assumption is false and the indicated range values are wrong. We can’t exclude the possibility that the target is much further away, near the water surface, going fast.