Black-Headed Duck : The Cuckoo Duck

The Black-Headed Duck is the only duck that's a brood parasite: it lays its eggs in the nests of other species. But unlike every other bird in the world that does this, it causes its host species negligible harm - because of what its ducklings do as soon as they hatch ...

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Music

Opening & Closing Themes: Running Waters and Acoustic Meditation by Audionautix (Jason Shaw), from audionautix.com. CC BY 3.0.

plus modified versions of:

Driving Through Tunnels, Call Me and Blue Lobster by Daniel Birch, CC BY 4.0

Quiet The Mind Instrumental by Mr. Pepino, CC BY 3.0

Let's Start At The Beginning by Lee Rosevere, CC BY 3.0