Not, in this case, meaning the archaeology of extraterrestrial or other non-human societies, but archaeology by non-humans. Specifically, dolphins. According to the story here, a team of U.S. Navy dolphins being trained to locate mines found instead a Howell torpedo dating to 1889. The Howell was the first self-propelled torpedo used by the U.S. Navy – previously, the term “torpedo” had been applied to a wide variety of bombs and mines that were stationary, free-floating, or mounted on the end of long spars and used for ramming.
It’s an impressive find, but for now I’m still not too worried about being replaced by a dolphin. The sites I excavate are generally on land, plus the fact that I have hands does give me a bit of an advantage.