Even though it might seem to people who have been sprayed by skunks that the reason for their stinky smell is to annoy us, there is actually a much more important reason why these animals make and squirt their juice. Skunks use their spray to protect themselves from predators (other animals who are trying to attack them). When the average skunk believes that another animal is about to hurt him he will warn it to get away by doing a few things first. Some types of skunks will also hiss or stand up on their front legs. If the predator does not back away, the skunk shoots a cloud of his smelly juice into the air in front of the other animal so that it will have to walk through it to get to him. Skunks are able to spray their juice up to 15 feet. When the predator comes near the cloud of spray he usually is so bothered by the smell that he leaves the skunk alone. The odor from the spray is so powerful that it even keeps bears from attacking skunks!

Which sentence in this paragraph needs to be revised because it is not precise enough?