The North American Aerospace Defense Command (NORAD) has been tracking Santa's sleigh and his nine reindeer since 1955 ... help of airmen to help field them all. Over time, it became a joke ...

Reindeer vary in size but all types are surprisingly small. The largest subspecies of reindeer – the woodland caribou – is about 1.2m at the shoulder, whereas the thickset body and dumpy legs ...