1. Heavy feathers.
Feathers weigh as much as two to three times the weight of the body of a baby bird. When ducks moult, the new feathers are filled with blood, making them so heavy that the duck canít fly. The blood leaves the feather as it matures.
2. Efficiency food.
Grebes ingest their own feathers and feed them to their young. Well, why not? Feathers are pretty well pure protein in the form of keratin. Some dog foods contain feathers to help treat allergies.
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