We once asked Jack Bender (director and producer, "LOST" 2004-2010) why JJ Abrams kept everything about the polar bears a secret. "The polar bear scenes are a big source of curiosity about the series. We don't want to let the audience know too much.", he told me.
Every show, we learn something new.
Here's a shot of our rigs on set in Hawaii during 2004. Our polar bears appeared in the pilot as well in several of the following shows.