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  1. Which one of the following is considered as nature’s radar?
    1. Hippopotamus
    2. Pigeon
    3. Vulture
    4. Owl
Correct Option: B

In the Second World War, pigeons were used less due to advances in telecommunication systems and radar, but they were still used in active service in Europe, India and Burma. The last pigeon messaging service was disbanded in 2006 after 60 years of active service in India.


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