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There are two reasons for this phenomenon. First, birds instinctively preen (groom) themselves when their feathers become dirty. The way they do this is with their mouths, and therefore, oil is necessarily swallowed. The second is that the oil gets on their skin, preventing it from getting necessary exposure to air.

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15y ago
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12y ago

It keeps them dry. When a pigeon get wet and stays wet, it is sick.

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13y ago

cos its sticky!

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12y ago

It burns them!

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Q: Why do birds die if their feathers often become covered in oil?
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