The King Penguins leave their birdhouse exhibit to go to an outdoor display. They do this during the winter when it's cold enough for them to be outside.
By the look of things we will be the ones to build the enclosures and we would just plop that hay object on the ground and they'll lay/sleep there.its not only out, but in.. most zoo have to incorporate training to get animal into their barns/houses. They need them there for protection from elements, feeding, medical exams, maintenance of the outdoor parts of the exhibits. Specifically, I know that Disney's Animal Kingdom uses a series of different whistles and sounds for each animal. If this wasn't done, keeper would waste hours chasing done or luring animals to where they need them. Remember, we are talking about zoos...the animals are not in the wild and need this training to survive. One thing I feel so far that PZ game is missing is animal enclosures...at least from the screen captures we have seen so far.