Now, we shall have a close look at how animals deal with space. Animals also react to space and in ways that are predictable for each species. For example, many have both a flight distance and a critical distance. If any creature sufficiently threatening comes within flight distance of the animal, it will run; but if the animal is cornered and the menace continues to advance until within critical distance, the animal will attack. A lion tamer apparently manipulates a lion by knowing to a hair what the beast's critical distance is. The trainer steps across this sensitive boundary and the lion springs at him, landing on the stool that stands between them. Instantly, the man backs off until he's beyond critical distance. And the animal stays where it is, no longer impelled to attack. A human being's personal space bubble represents the same kind of margin of safety. Let a stranger breach the bubble and the need to flee or to strike out usually surfaces immediately.