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The nursery with a food-delivery slot
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- She seals herself inside.
A hornbill turns a tree hollow into a nursery.
- The entrance gets smaller.
The female seals the opening, leaving a narrow slit.
- One slit. Every meal.
The male brings food through the opening.
- A nursery behind the wall.
Inside, the female incubates the eggs and tends the chicks.
- The wall comes down.
As the nesting cycle advances, the family returns to the outside world.
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