"Jump day" is the day the ducklings leave the nest, which is usually 24 hours after hatching.
Wood Ducks often make their nests in holes in trees, many feet off the ground. On "jump day," the hen waits on the ground and calls the ducklings. They have to jump out of the nest and fall to the ground.
I didn't see these ducklings jump, but they are so tiny, this has to be their first day on the water.
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