Vision and Echolocation

Vision and echolocation have many features in common. | Echolocation is adaptive only in an ecological niche where vision is impossible or badly impaired for instance when dwelling in caves and hunting at night, as bats do. | Why, then, is vision so common and echolocation so rare? | One narrow range of radiation light in the case of vision, ultrasounds in the case of echolocation-provides information relevant to a wide variety of cognitive and practical goals. | Because, in most environments, vision is much more effective.