Killer whales in Puget Sound aren't doing very well. They were placed on the endangered species list in 2005, and there are several hypotheses for why they're not recovering.
In Puget Sound, a team of researchers is relying on a secret weapon with a killer nose to figure out what's wrong with the orcas in Northwestern waters.
'A Treasure Trove Of Information'
Scientists suspect lack of food, boat traffic and pollution are to blame, but no one knows for sure. Some think the answer might be found in the whales' wake — specifically, their poop.