Male Marsh Wrens will build several--as many fifteen--dome shaped shells in the reeds to woo females. He'll sing from high in the cattails to attract a female to select a bare frame in his territory. Once the "right" one is chosen, she will collect material like cattail down, feathers, and grass to build the nest where she'll lay her eggs. Photographer Gregg Thompson found this industrious little bird gathering cattail down.
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All photos © Gregg Thompson