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Bats emit ultrasonic sound because it offers several advantages for echolocation, which is their primary way to navigate and hunt in the dark:

Reasons bats use ultrasonic sound:

1. High resolution:

Higher frequencies have shorter wavelengths, which gives better detail and precision when detecting small objects like insects.

2. Directional control:

Ultrasonic sounds can be more focused like a beam, helping bats determine the exact location and direction of objects.

3. Avoiding noise interference:

Ultrasonic frequencies are less likely to be masked by environmental noise (e.g., wind, rustling leaves) which is mostly in the lower range.

4. Stealth from prey:

Many insects can't hear ultrasonic sounds well (though some, like moths, have evolved to detect them), making it easier for bats to approach silently.