Ospreys are remarkable nest builders. Many reuse their massive stick nests from the previous year, but continue tinkering with it once the nesting season begins. And the nest transforms along with the growing chicks. It’s bowl-shaped at first, corralling the young birds, but it gets flatter after the chicks hatch. By the time they fledge, it has fully flattened out.

More info and transcript at BirdNote.org. 

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