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https://www.kumbartcho.org.au/frog-calls
Frog Calls | sanctuary
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https://www.impressivefacts.com/fact/bull-frog-calls/
The american bull frog makes three distinct calls, one of them is used to... | Impressive Facts
Animals Fact: The american bull frog makes three distinct calls, one of them is used to indicate a fight is about to start.