This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Owlman (Cornish)
In Cornish folklore, the Owlman, sometimes referred to as the Cornish Owlman, or the Owlman of Mawnan, is an owl-like humanoid creature said to have been seen in 1976 in the village of Mawnan, Cornwall, UK. The Owlman is sometimes compared to the American Mothman legend from the mid 1960s; however, a Eurasian eagle-owl is likely the source of the legend.
The story originated when Tony "Doc" Shiels claimed to have investigated a report of two young girls on holiday in Mawnan who saw a large winged creature hovering above the tower of St Mawnan and St Stephen's Church, Mawnan on 17 April 1976. Sporadic claims of "Owlman" sightings in the vicinity of the church circulated in 1978, 1979, 1989, and 1995, and according to legend, a "loud, owl-like sound" could be heard at night in the Mullion church yard during the year 2000.