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Frogs That Sound Like Birds
It's like Shazam, But for Frog Mating Calls - The New York Times
CREATURE FEATURE – Chorus Frogs – Friends of the Rouge
Calls of Frogs and Toads of the Northeast
More Signs of Spring: Chorus Frogs Singing! Winter Wrens Courting
On Finding Joy in Frogs and Spring
When Frogs Sing Their Evening Song, Listen for Nature's Greatest
BOOM! BELLOW! BLEAT! and other spring cacophonies! – Buffy Silverman
Peepers Enjoy Singing in the Choir - State Parks Blogs