What modified structures form the namesake rattle at the tail tip of a rattlesnake?
Answer
Keratinous segments.
The distinctive rattle found at the tail tip of rattlesnakes is composed of successive keratinous segments. These segments are modified tail scales that become loosely attached to each other as the snake grows and sheds its skin. When the snake vibrates its tail muscles, these segments click against each other, producing the characteristic warning sound that clearly identifies this specialized type of reptile.
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