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Rattlesnakes change their rattle frequency based on nearby threats, a study finds - Boston News, Weather, Sports | WHDH 7News
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What's the difference?: Fox snake vs. eastern massasauga rattlesnake | Forest Preserve District of Will County
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Rattlesnakes Fool Humans Into Thinking They're Nearby With This Sound-Warping Trick | Smart News| Smithsonian Magazine
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