Why do predators have a better sense of smell than herbivores?

A good sense of smell helps predators smell prey when they are miles away. Animals can even sense danger around them and run to safety. Animals with a keen sense of smell are mostly those with poor eyesight. Since they cannot see well, they make up for their weakness by developing their ability to smell. Thus, they can prevent themselves from becoming food (prey for other animals), as well as finding food for themselves. For example, bears can smell better than any other animal on the planet because the olfactory area of ​​the bulb in the brain is 5 times larger than in the human brain.