Write the next sentence in the following story.

How to take care of ducklings 
Find a brooding box. 
After ducklings have hatched from their shells and spent about 24 hours getting used to their new surroundings, they're ready to move to a brooder. A plastic storage container, sturdy cardboard box, or large glass aquarium can all work for this purpose.
The box should be well-insulated, since the ducklings need to stay warm. Don't choose a box with too many holes in the sides or the bottom.