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An Ecuadoran ornithologist with rare images of the blue-throated hillstar. Rodrigo Buendia / AFP / Getty Images

By Jason Bittel

Somehow the striking blue-throated hillstar, a hummingbird with an emerald-feathered head and sapphire splash across its neck, managed to elude us for a very long time. Scientists just recently discovered Oreotrochilus cyanolaemus, describing the species for the first time in The Auk: Ornithological Advances.

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Western tanager. Dennis Morrison

By Jane Kirchner

Right now, more than a 150 species of birds are on their way northward from tropical wintering grounds to take advantage of emerging insects, budding plants and an abundance of nesting locations. While larger birds tend to travel during daylight hours, songbirds and smaller species fly at night and will stop off and stick around for a day to eat and build up fat stores before continuing their journey. The best time to see and hear them in your yard is the first two hours after the sun rises!

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