In May, the Oregon Department of Fish and Wildlife received a tip that an unusual-looking crayfish was spotted in a creek around Lithia Park in Ashland. Biologists from the state agency laid out traps and confirmed the presence of Northern crayfish which are native to the Midwest. It marks the fourth invasive species of crayfish now found in Oregon waterways. Sampling conducted by ODFW scientists found that Northern crayfish had moved from the Ashland canal to Bear Creek near Medford, 15 miles away, and raised concerns that they could already be in the Rogue River. Rick Boatner is the invasive species coordinator for the Oregon Department of Fish and Wildlife. He shares with us how the aggressive crustaceans are proliferating in Southern Oregon and the threat they pose, not only to native Signal crayfish but also to endangered steelhead and salmon.