Blackbirds, it turns out, aren’t actually all that black. Their feathers absorb most of the visible light that hits them, but still reflect between 3 and 5 percent of it. For really black ...

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Plenty of birds have black feathers: crows, ravens, cormorants, the aptly named blackbird. But when it comes to stunningly dark plumage, none of them compare to birds of paradise, a group of 39 ...