Milkweed seed pods.

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During World War II, the regular material used to stuff life jackets was in short supply, so milkweed floss was used as a substitute—it is about six times more buoyant than cork. Milkweed plants support 12 species of butterflies and moths, including the Monarch butterfly.

Tree Burl

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Poachers often cut off the burls from the sides of the trunks using chainsaws, which exposes the tree to infection and disease, or fell the entire tree to steal burls higher up. Wikipedia