Over about 25 hours in April 1977, three Dover teenagers separately reported a thin, big headed creature with glowing eyes. We follow the sightings in order and weigh the moose, foal and prank theories.

Since at least 1913 people have reported glowing lights above Brown Mountain in western North Carolina. Two USGS studies blamed trains and cars, and a modern camera project is still trying to catch them.

In the summer of 1946 Swedes reported close to 1,000 sightings of rocket-like objects. The military dragged lakes for wreckage, and US intelligence told President Truman the Soviets were probably testing missiles.

In March 1876 what looked like flakes of meat fell from a clear sky onto a farm in Bath County, Kentucky. Samples went to scientists, and their findings sparked a debate that still has no firm answer.

On November 23, 1953, an Air Force F-89 sent to intercept an unknown radar target over Lake Superior vanished with its pilot and radar operator. The official account and the UFO story differ.

The last known thylacine died in Hobart in 1936, but reports of striped animals in the Tasmanian bush have never stopped. Researchers have now tried to put numbers on those sightings.

In January 1954 a run of dead dogs and newspaper talk of a ‘vampire’ beast brought up to 1,000 armed hunters to the swamps around Bladenboro, North Carolina. A bobcat was trapped and put on show, but even the mayor was not sure it was the killer.

Since December 1981 people in a small Norwegian valley have reported lights that hover, flash and race away. Radar, cameras and a university observatory have measured them, yet plasma, ball lightning and a valley-sized battery all remain contested explanations.