What material makes up the interlocking, hollow segments forming the distinctive rattle structure of the Western diamondback?

Answer

Keratin

The defining feature of the Western diamondback, its rattle, is an evolutionary adaptation serving as an aposematic, or warning, signal. Structurally, this organ is constructed from interlocking, hollow segments. These segments are explicitly composed of keratin, which is the identical structural protein that forms human fingernails and hair. The rattle grows incrementally as the snake periodically sheds its skin, with a new segment being added to the tip of the structure during each successful shed cycle.

What material makes up the interlocking, hollow segments forming the distinctive rattle structure of the Western diamondback?
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