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Museum of Discovery - True Frogs: American Bullfrog Calling from April to July Sounds like: low-pitched “Rummm” - like a lightsaber! Listen to call: http://www.herpsofarkansas.com/wiki/uploads/Frog/Lith obatesCatesbeianus/DS300067.mp3 | Facebook
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American bullfrog - Wikipedia
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File:American Bullfrog Rana catesbeiana Side 1800px.jpg - Wikimedia Commons
