In the earliest part of spring, when it may not feel too spring-like at all, you might step outside one night and hear it—a faint, mournful hooting, far overhead. If you look up then, and the skies are clear, you might be lucky enough to catch a glimpse of this spring phenomenon: a wavering white line of birds moving across the night sky, glinting in the moonlight. These are whistling swans, headed from their winter home on the East coast to their nesting grounds in the arctic.
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