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Arbor Day
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World Penguin Day
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White trilliums blooming in Ontario, Canada
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World Book Day
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Earth Day
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National Park Week continues
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National Park Week begins
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Ring of Brodgar, Orkney, Scotland
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International Day for Monuments and Sites
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Black bear cub emerging into spring
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Union Square, Manhattan
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World Art Day
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Bowling Ball Beach in Mendocino County, California
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Apple trees in spring, Germany
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Arches National Park, Utah
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Churún Merú waterfall in Venezuela
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Siblings Day
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Skagit Valley Tulip Festival
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Total solar eclipse
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International Beaver Day
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Castle Day in Japan
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The Bahamas
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Red lechwe, Okavango Delta, Botswana
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Find a Rainbow Day
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Beech trees and wild anemones, Jutland, Denmark
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April Fools Day
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Happy Easter!
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Brown-throated three-toed sloth in cecropia tree, Costa Rica
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South Stack Lighthouse, Holy Island, Wales
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Cherry blossoms in Shanghai, China