This is a true "mystery owl", because noone has been able to qualify it properly yet. It is well-known, because a pair usually perches conveniently just by the lights of the road leading up to Cabañas San Isidro, near Baeza in eastern Ecuador, a tourist facility. This owl looks like a hybrid between Black-banded owl (Strix huhula) and Black-and-white owl (Strix nigrolineata), but it lives at higher elevation, roughly 2,000 meters above sea level, than any of the other species. The last hypothesis I heard, was that the San Isidro Owl may be a subspecies of Black-banded owl. What speaks against this, is that the hooting song is more like the one of the Black-and-white owl. We will have to wait until genetic studies solve this mystery.