This recording comes from a French sound effects library credited to Sound Fishing Bruitages, catalogued as a reverberated wolves effect. The French title loup garou refers to a werewolf, which is why the clip is shared for monster and horror edits rather than nature documentaries. Online, creators reuse long wolf cries like this one for Halloween videos, horror game edits, roleplay scenes and full moon transitions, because the echo makes a simple animal call feel supernatural and much larger than a plain field recording would.