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Skip to main content Close Search Help Topics Features Blogs Video Podcasts Magazine Archive Subscribe Newsletter About Us Advertise Login Register Twitter Facebook YouTube LinkedIn American Scientist Open navigation Search Help Login Our apologies: The page you're looking for either cannot be found or has moved. Please: Check the web address spelling; Browse our Topics or archive of Magazine and Blog articles; Search the site; Go to our homepage. TWITTER FACEBOOK YOUTUBE LINKEDIN TOPICS FEATURES BLOGS VIDEO PODCASTS MAGAZINE ARCHIVE SUBSCRIBE NEWSLETTER ABOUT US ADVERTISE LOGIN REGISTER SEARCH HELP Unseen animals can often still be heard. That... SUBSCRIBE GIVE A GIFT DONATE A Publication of Sigma XI © 2025 Sigma Xi, The Scientific Research Honor Society Share this selection Tweet