Pigeons are known to have coexisted with humans since thousands of years ago. This is evidenced in a first picture of a pigeon found by archaeologists in Mesopotamia (Iraq) that have existed since 3000 BC.
Pigeons have a pair of eyes on the side of the head. Therefore, pigeons have a monocular view rather than a binocular. He will nod his head to make his eyesight more clear.
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From @fadil21