Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to take care of ducks [title] House your ducks in a secure pen. [step] Ducks require a safe structure to live in. An enclosure or pen will keep them from wandering (or flying) away from your house and allow them a measure of safety.

Ending1: A pen with chicken-wire walls can provide these ducks with a barrier to escape from predators. [substeps] A sturdy hose, preferably with a bottle attached, should be securely installed along the sides and bottom of the pen. Ending2: You can erect a suitable enclosure using chicken wire or another fencing material. If the ducks will be spending their days in this pen, it should provide 1.5 square meters (16 square feet) of space per duck. Ending3: [substeps] Remember that ducks not only can't fly in their pen, they also don't like to mate or lay eggs. If you have ducks near a tank, make sure to keep the water easy and clean. Ending4: [substeps] You may place ducks in a fenced-in enclosure or secure protective cage with metal or glass bars. You may also put hammocks or bedding inside of each coop, so that ducks can easily leave to entertain themselves.

Answer format: ending1/ending2/ending3/ending4