My human ancestors were indeed great hunters. In order to survive, they had to learn how to disguise themselves from their prey, vanishing into the background to become completely undetectable. Just so you know, you were nicely visually camouflaged today amongst the fallen leaves when you were trying to capture the squirrel. But stealthy you are not when it comes to the amount of noise you make, and I could hear you from 50 yards away. Lucky for you your survival is dependent only on food that comes from a bag.