| 1. | The male expands his distinctive elongated vocal sac to produce a chirping call.
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| 2. | The female has a dark-spotted belly and lacks a vocal sac.
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| 3. | "Arthroleptides " species have distinct tympana and no external vocal sacs.
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| 4. | They lack vocal sacs but all species are known to call.
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| 5. | They have acute hearing but no vocal sac, and also lack nuptial pads.
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| 6. | The males have vocal sac and start calling at dusk.
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| 7. | The vibrations of the larynx emits a sound, which resonates within the vocal sac.
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| 8. | The vocal sac is like a balloon pushing air out.
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| 9. | The vocal sac of the male is not well developed.
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| 10. | The male has two well-developed internal subgular vocal sacs.
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