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Do bats have good eyesights?
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*** g03 3/8 Amazing Senses in the Animal World ***
The bat family comprises about 1,000 species. Contrary to the popular view, all have good eyes, but not all use echolocation. Some, like fruit bats, use their excellent night vision to find food.
Bats emit a complex signal with a number of frequency components ranging from 20,000 to 120,000 hertz or higher.
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Insects Beware!
?Each day, just around dusk, a truly astonishing event takes place under the rolling hills near San Antonio, Texas [U.S.A.],? says the book Sensory Exotica?A World Beyond Human Experience. ?At a distance, you might think you saw an enormous black cloud billowing from the depths of the earth. However, it?s not a cloud of smoke that darkens the early evening sky, but the mass exodus of 20?million Mexican free-tailed bats from the depths of Bracken Cave.?
A more recent estimate places the number of bats exiting Bracken Cave at 60?million. Climbing up to 10,000?feet [3,000?m] into the night sky, they pursue their favorite meal, insects. Although the night sky must contain an overabundance of ultrasonic bat calls, there is no confusion, for each of these unique mammals is equipped with a highly sophisticated system for detecting its own echoes
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Bats use other sensors, to help them see, like sonar, hence the saying ' Blind as a Bat '