Source: https://www.youtube.com/watch?v=h_f7ElR3oVs Video Source: http://www.kcra.com/article/100-acre-grass-fire-burning-near-mather-airport/10256173 While watching coverage of a minor grass fire in Rancho Cordova at around 4:40, July 3 2017, I saw a weird black shape fly out of the smoke. via GIPHY Source: https://giphy.com/gifs/3oKIP5aMTTgVP7BZ3G/html5 This is the type of thing that would be classed a UFO, but luckily the cameraman followed the shape and zoomed in, revealing it to be a hawk. via GIPHY Source: https://giphy.com/gifs/xUOrvXLOXpHHQeqh3O/html5 The curious sideways motion seems to be a parallax effect from the movement of the helicopter, but might also have been angling into the wind. I'm posting this largely as an example of how initial impressions can be very confusing when you don't know how big something is, how far away it is, what direction it's moving in, and what direction the camera is moving in. In fact some portions of the video closely resemble videos of things that were identified to be flies close to the camera, but other more imaginative people took to be large flying craft a long way off.