Species distribution can be understood through factors like glaciation.
Hans Hahn -LRB- 21 February 1919 -- 11 October 1941 -RRB- was a Luftwaffe night fighter ace and recipient of the Knight 's Cross of the Iron Cross during World War II .. Luftwaffe night fighter ace. List of German World War II night fighter aces. The Knight 's Cross of the Iron Cross was awarded to recognise extreme battlefield bravery or successful military leadership ; his was the first awarded to a night fighter .