The Common Ravens in Yellowstone National Park are notorious for entering the open window of a snow coach to search for food or tearing apart back packs left on unattended snow sleds with their strong, versatile beaks. When we stopped for lunch one noon-time along the Yellowstone River, this Raven suddenly appeared as if out of nowhere and was soon joined by his mate. Ravens are very smart birds. This banded Common Raven, known popularly in the park as Cheddar, also had a telemetry antenna protruding from his back attached to a feather so it can be tracked in real time. An App called Animal Tracker will zero in on the location of one of these banded birds. They are studying the relationship between Common Ravens and Gray Wolves.