Looking at the 2nd shot, the source video is 20 fps and the object is in view for a total of 19 frames. Crossing a distance of about 8 feet.
8 ft / 19 frames
20 frames / 1 sec
3600 sec / hr
1 mile / 5280 ft
gives an estimated speed of 5.7 mph
(I knew that class exercise in elementary math class would come in handy eventually!)
I've watched a lot of videos made by this camera under similar conditions and I can't find any examples of motion blur, it seems to have a very fast shutter speed. So I am inclined to think that the object really is as long as it appears to be in the video.
It's also fairly maneuverable. It comes in just on the far end of the left legs, goes wide around the feeders, and then banks sharply to the right to come in inside the right legs before leaving frame.
