Frogs and toads: What's the difference? - The Washington Post
Frog and toad, Types, Habitat, Diet, & Characteristics
How Do Frogs Make Sound and Hear It? - The Infinite Spider
Are you friends with frogs?
Bird voice treefrog, Hyla avivoca
Frogs in Massachusetts
Mockingbirds Mimic Frogs
Frogs That Sound Like Birds
American Bullfrog (Wild Republic FrogWatch USA, by K&M International) – Animal Toy Blog
New species of frog sings like a bird
Bird-voiced Treefrog – Discover Herpetology
When Frogs Sing Their Evening Song, Listen for Nature's Greatest
Birds That Sound Like a Frog: Surprising Facts and Calls - Spark Lark
Why Spring Peepers Are More Often Heard Than Seen
Make It Easier To Be Green. Show Frogs Some Love.