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Bird wings are made of feathers, but also hollow bones that help reduce the overall weight, and powerful muscles. These structures work together to generate lift and thrust, which can take migrating birds through literally half the world.
Insect wings are made of chitin - a tough, flexible polysaccharide (basically sugar molecules linked together) that makes up their outer exoskeleton. This material is arranged as a thin, double-layered membrane. It is supported and strengthened by a network of hollow veins and provides structural support.
Bat wings are made of living skin stretched over elongated finger and arm bones. This membrane, called the patagium, also contains nerves, muscles, and elastic fibers. Because bats are mammals, their wing bones are structurally similar to a human hand and arm (so we see what we miss on because we don't have wings).
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