Two Californians found the skeletal remains of a massive sea creature while on a beach walk near San Francisco last weekend, according to reports. The creature has been identified as a modern gray whale, which went extinct in North America around the early 18th century, Robert Boessenecker, a research associate at UC Berkeley’s Museum of Paleontology, told SFGate. The National Ocean and Atmospheric Association said it’s hopeful the massive creature’s endangered cousins will someday return to the waters off California, making discoveries like these more common.