Livescience.com (Utah, USA) May 20th, 2010 12:13 PM: Tree Frogs Say "I Hate You" By Shaking Violently
Male red-eyed treefrogs defend their turf by violently "tremulating" their bodies; and other males respond. Scientists created a robotic frog to test out whether males responded to the vibrations or the visual body-shaking.
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I have never observed this behavior before and I keep and breed this species.
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