Welcome the Whales celebrates the return of the dozen or so gray whales, known as the Sounders, who come to Possession Sound and Saratoga Passage each spring to fill up on ghost shrimp burrowed in the mud flats. For about about this unique sub-population of Pacific Gray Whales, see: Gray whales learn daring feeding strategy in Puget Sound: Digging for ghost shrimp at high tide.