A Baltimore oriole perches near apple blossoms in Mendota Heights, Minn. Universal Images Group via Getty Images hide caption

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A greater rhea grazes in a canola field near Utecht in northern Germany in 2012. A similar bird has been loose in the English countryside for the past month. DPA/AFP/Getty Images hide caption

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A Sandhill Crane flies in at sunset to roost for the night in the wetlands of the Monte Vista Wildlife Refuge in Colorado. Migrating along the same route they've followed for thousands of years, about 25,000 Greater Sandhill Cranes pass through the San Luis Valley in late winter every year. Doug Pensinger/Getty Images hide caption

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