From Laura Klappenbach,
Your Guide to Animals / Wildlife.
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Definition: 1. n. A group of feathers located on the mid-back of a bird. (Source: Sibley)

2. n. A soft extension of the body wall present in some invertebrates including brachiopods and mollusks. Some organisms that posses a mantle secrete a shell from their mantle. (Source: Hickman)

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