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Welsons frog (Rana welsonii)
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Welsons frog (Rana welsonii)
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Green frog (Pelophylax esculentus) North Rhine-Westphalia Germany Europe by Dieter Mahlke
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Natterjack toad (Epidalea calamita) mating male with inflated bell Thuringia by Franz Christoph Robiller
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Natterjack toad (Epidalea calamita) mating male with inflated bell Thuringia by Franz Christoph Robiller
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Natterjack toad (Epidalea calamita) mating male with inflated bell Thuringia by Franz Christoph Robiller
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Natterjack toad (Epidalea calamita) mating male with inflated bell Thuringia by Franz Christoph Robiller
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Natterjack toad (Epidalea calamita) mating male with inflated bell Thuringia by Franz Christoph Robiller
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Natterjack toad (Epidalea calamita) mating male with inflated bell Thuringia by Franz Christoph Robiller
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The European edible frog Rana esculenta croaking with its twin vocal sacs inflated The sacs are used as a resonant cavity to increase the volume o
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European green toad (Bufo viridis) mating male with inflated bell Thuringia Germany Europe by Franz Christoph Robiller
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European green toad (Bufo viridis) mating male with inflated bell Thuringia Germany Europe by Franz Christoph Robiller
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European green toad (Bufo viridis) mating male with inflated bell Thuringia Germany Europe by Franz Christoph Robiller
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Natterjack toad (Epidalea calamita) courtship display calling male with distended bell Thuringia Germany Europe by Franz Christoph Robiller
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Japanese tree frog singing in a rice paddy at night Change of vocal sac Serial photos 35
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Researcher holding two male toads On the right the male toad has a very clear vocal sac due to exposure to noise pollution for ten days The toad on
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Male bush frog calling
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Male bush frog calling
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Glass frog and eggs
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Blue-eyed tink frog
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Rana esculenta an edible frog found throughout Europe Although not native to Britian several colonies have been introduced The picture shows a mal
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Toad tree frog
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Physalaemus pustulosus trinitatis frog found in Trinidad in Central South America The vocal sacs of this male frog are fully inflated as it lies
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Bush frogs Two male bush frogs (Philautus anili) This species is found in the Western Ghats in the state of Kerala in India
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Ornate narrow-mouthed frog
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Shreves Sarayacu treefrog calling
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Peruvian rain frog (Pristimantis peruvianus) calling at night In some frogs the calls made are amplified by inflating throat skin membranes called v
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RF- Pool Frog (Rana lessonae) vocalising with vocal sacs inflated Danube delta rewilding area Romania Photo by Wild Wonders of Europe Widstrand
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Edible Frog (Pelophylax esculentus) with sound bubbles reflection garden pond Oelsnitz in the Vogtland Saxony Germany Europe
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Edible frog (Pelophylax esculentus) in water vocal sac Hesse Germany Europe
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Edible frog (Pelophylax esculentus) in water vocal sac Hesse Germany Europe
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Male Banded bullfrog calls for a mate with vocal sac inflated during mating season
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Male Banded bullfrog calls for a mate with vocal sac inflated during mating season
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Calling Waxy monkey tree frog (Phyllomedusa sauvagei) with vocal sac Gran Chaco Paraguay
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