Totally a guess here, but Phillip?s comment about the veil and the silhouette gave me an idea. Mammals? brains are wired to find faces, and I have learned since my family got goats that prey animals are sensitive to heavy eye contact, since stalking predators obviously display that. Perhaps since the veil masks your face, they don?t think you are looking at them, and therefore don?t really view you as a threat. Again, just brainstorming, no idea if that?s correct or not.