This snowy white owl actually looks almost the same as it did in colour. The soft white look of its feathers doesn't change very much when I convert to monochrome, and it's really the eyes and the background that seem to give it away. This one is from the Calgary Zoo, and the owl sits and observes. You can actually go inside the enclosure with the owls and get a nice unobstructed view. Other than the turning of its head, the owl was completely still and would seemingly sit there for hours like this.
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From @mmckinneyphoto13