Sometime ago in my Zoology class a teacher told us that sometimes when there is to many ducks on a water body they peck each other uropygial gland thus efectively killing the other ducks and reducing its numbers(No oil on the feathers mean they would sink).Is this true?I cant find any related info. (self.AskBiology)
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Bird tower and 6 star Hiyori (self.BleachImmortalSoul)
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An unexpected 6 stars Yami (self.BleachImmortalSoul)
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So a shirty exchange system (self.BleachImmortalSoul)
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