The Freiburg Shrieker is an unverifiable internet legend which circulated on various paranormal websites such as AmericanMonsters, Unexplained-Mysteries, and UnknownExplorers around 2005. It is unclear how the information was originally obtained before being posted to the internet. There is no known evidence to show that the supposed witnesses exist or that the tale is anything more than an online story.
The following is the unverifiable internet story:
In September 10th 1978, at a mine in Freiburg, Germany, a group of twenty-one miners arrived in the morning to find a dark figure with wings on its back in the entrance to the mine. When they approached it, it unfurled its wings and let out "a sound like fifty people screaming" or "a train in peril trying to break at the sight of a twisted rail".
Opting to stay outside the mine and work on other tasks, the workers were soon disturbed by a large explosion in the mine itself. The entity's presence had prevented them from entering the mine, and thus saved their lives.
However, six out of the twenty-one workers apparently saved by the monster were still working at the mine only six months later. Two of those men, who had pledged to detail the indisputable facts of the case for the rest of the world, perished suddenly, broke and destitute. Others were plagued by psychiatric problems. The dark winged creature came to be known as "The Freiburg Shrieker."
Sources: http://web.archive.org/web/20061019130158/http://www.americanmonsters.com/monsters/ avian/index.php?detail=article&idarticle=222 (2005 Post) http://www.unexplained-mysteries.com/forum/topic/72221-mothmans-family/ #comment-1236099 (2006 Discussion) UnknownExplorers . com/FreiburgShrieker.php - Broken Link (Unknown Date) Mysteries Unwrapped: Mutants And Monsters by Oliver Ho (Pg 33) (2008) Book Link - https://books.google.com/books?id=iz8Rz0ixJxQC&pg=PA33#v=onepage&q&f=false