High level bird strike
About 5 years ago I was P1 of an a330 Calgary to London. In the cruise at about FL330 (we were kept down due to other traffic ahead we would normally be much higher) when we heard a loud bang from the front left side of the nose It was in the middle of the night but good vmc. It was also the core height of an eastbound jetstream. No obvious sign of damage etc and on landing at LGW the only sign was blood streaks on the side of the fuselage below cockpit P1 opening window. A very few traces of feathers in the blood. A guy in the CAA at the time thought the only bird that flew that high was a Canada goose. Fortunately it was a glancing blow, otherwise the outcome could have been very different. And no, it didn't have any lights, and it wasn't squawking! Sure woke us up though!