The Brenin Llwyd (Grey King) is said to inhabit the mountains of Snowdonia in Wales. Reports of its appearance vary. It is sometimes described merely as a "presence", but it has also been reported to be large, hairy, man-like creature. It is similar to the Big Grey Man of Scotland, which is considered by some to be a flesh and blood creature, and by others to be a spirit or trick of the atmospheric conditions on the mountain.
Could this be the explanation for the Brenin llwyd?
Snowdon walker captures rare Brocken spectre
It does look like a large human shape. What do you think ,welsh bigfoot reality or spectre?