A cluster of birds' eggs, circa 1800. They belong to the brambling, the green woodpecker, the grey wagtail, the red-backed shrike, the hoopoe, blackbird, the bee-eater and the cuckoo. (Photo by Hulton Archive/Getty Images)

A cluster of birds' eggs, circa 1800. They belong to the brambling, the green woodpecker, the grey wagtail, the red-backed shrike, the hoopoe, blackbird, the bee-eater and the cuckoo. (Photo by Hulton Archive/Getty Images)

Download this HD photo of archival, color image, bird, and nest by Getty Images (@gettyimages)

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