An upward facing infrared camera captured this object moving from screen left to right in the direction pointed

An upward facing infrared camera captured an object moving from screen left to right in about half a second. Two images are provided to show the direction of motion. While a bug can't be ruled out, it didn't fly like a bug, the camera was focused on infinity so to be this large a bug would have to be very close to the camera, would be badly out of focus and would likely display some obviously bug-like features - but, as I said, I won't/can't rule it out as a possibility.