Imagine a jellyfish as wide as Dubs, with tentacles as long as the bell tower atop Gerberding Hall. The lion’s mane jellyfish, one of the world’s longest creatures, is part of the rich marine life within the Salish Sea, along with two iconic, interdependent endangered species: Southern resident orcas and Chinook Salmon. The Burke Museum exhibit “We Are Puget Sound” aims to inspire its preservation. It runs through Dec. 31.