Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to take care of ducklings [title] Find a brooding box. [step] 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.

Ending1: [substeps] 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. Ending2: Ducklings may not be comfortable letting other people out of their homes while they are looking for the nest. [substeps] Choose an aquarium that is suitable for working in a quiet, confined space where temperatures are under control. Ending3: Large windows and open doors are also great, as long as the temperature stays just below freezing. Look for a humidity-stabilized box lid or cover. Ending4: Remove your materials and fill it with sand and a few inches (about a foot) of water. The water should be warm and comfortable for your ducklings' acclimation to their new environment.

Answer format: ending1/ending2/ending3/ending4