If you are fortunate enough to see and photograph a mother grizzly bear like this one in Yellowstone, one of the first things you will notice is her careful attentiveness to her surroundings. Not only will she keep a watchful eye on her immediate environment, but she will also frequently pause to intentionally engage her most powerful sense, her nose. Her sense of smell is estimated to be 1,000x stronger than a humans. To help put that into perspective, a dog, whose sense of smell we use to detect bombs, is estimated to possess a sense of smell that is 70x stronger than a human. Imagine what we could do with a TSA grizzly. With this superpower, a mother grizzly is able to detect potential threats to her cubs from a considerable distance. When she detects danger in the air, her demeanor immediately alters. Standing up tall, she will sniff the air excessively while huffing at her cubs to alert them to the impending threat. Many times I have witnessed this behavior, and within 3o minutes a large male grizzly, which will kill bear cubs, arrives on the scene. Of course by the time I realize what posed the danger, the mother and cubs are long gone.