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Vocal Sac Collection

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Vocal Sac Collection: Sharp-nosed Reed Frog calling and Ethiopian Banana Frog (Afrixalus enseticola)
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Vocal Sac Collection: European Tree Frog USH 329 Calling Hyla arborea © Duncan Usher / ardea. com
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Vocal Sac Collection: Green Frog - with inflated vocal sacs - in garden pond - Provence - France
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Vocal Sac Collection: Hyperolius nasutus
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Vocal Sac Collection: American Toad - Calling in Spring - Connecticut USA
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Vocal Sac Collection: Spring Peeper (Pseudacris crucifer) - Male calling to attract female -New York - USA - Quite small
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Vocal Sac Collection: American Toad (Bufo americanus) - Male calling to attract female - New York - USA - 'Hop toad'
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Vocal Sac Collection: Gray Tree Frog (Hyla versicolor) - Calling to attract mate - New York - USA
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Vocal Sac Collection: Long Reed Frogs PS 9577 Males fighting for calling perch © Peter Steyn / ARDEA LONDON
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Vocal Sac Collection: Lake Frog - calling - Switzerland
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Vocal Sac Collection: Stripeless Tree Frog - calling - France
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Vocal Sac Collection: Dainty Green Treefrog - Mossman - Queensland - Australia
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Vocal Sac Collection: Glass Frog - Manu National Park - 1800m - Peru
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Vocal Sac Collection: Siamang Gibbon - adult in tree calling, throat sac enlarged

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