Discussion
Bats can fly in dark because
Answer: C
Bats fly in the dark because they are guided by ultrasonic waves produced by them.
This is echolocation. A bat emits high-frequency sound pulses, well above the range of human hearing, and listens for the echoes from obstacles and prey. From the delay and direction of the echoes it judges distance and position, so it can navigate and hunt in complete darkness.
Bats do not rely on vision in the dark, and many species have small eyes, so better night vision and large pupils are not the reason. 'Any bird can do so' is simply false: bats are mammals, and most birds cannot fly blind.
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