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While I lay awake one night a few weeks ago listening to the bullfrogs in the pond near my home, a train whistle sounded. The "jug-o-rums" stopped -- temporarily -- then resumed. Did they hear the train whistle, and, if so, were they afraid of or confused by it?

Wildlife Expert - Ken Burton

The frogs most certainly did hear the whistle. Their hearing is at least as good as yours; frogs wouldn't be such vocal creatures if they couldn't hear well. Any sudden, unexpected noise will cause calling frogs to stop calling until they "decide" it's safe to resume. They don't want to draw attention to themselves if potential danger is near.

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American Bullfrog
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