What does the presence of the rattle in rattlesnakes serve as, evolutionarily speaking?

Answer

An effective aposematic (warning) signal

Rattlesnakes have evolved the conspicuous rattle, which serves as an effective aposematic signal, often allowing them to avoid physical conflict entirely if the sound is heeded.

What does the presence of the rattle in rattlesnakes serve as, evolutionarily speaking?

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Mexican Cantil (Agkistrodon bilineatus) - YouTube

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