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Couch's Spadefoot (Scaphiopus couchii) adult at night calling with vocal sac inflated. Laredo, Webb County, South Texas, USA, April.
01350337
Rolf Nussbaumer / Couch's Spadefoot (Scaphiopus couchii) adult at night calling with vocal sac inflated. Laredo, Webb County, South Texas, USA, April.
European Tree Frog (Hyla arborea) calling, Switzerland
00449884
Thomas Marent / European Tree Frog (Hyla arborea) calling, Switzerland
European green toad (Bufo viridis) calling, vocal sac inflated, in a pond (at 2,711m) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008
01242175
Wild Wonders of Europe / Schandy / European green toad (Bufo viridis) calling, vocal sac inflated, in a pond (at 2,711m) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008
European green toad (Bufo viridis) calling, vocal sac inflated, with eyes closed, in a pond (at 2,711m) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008
01242176
Wild Wonders of Europe / Schandy / European green toad (Bufo viridis) calling, vocal sac inflated, with eyes closed, in a pond (at 2,711m) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008
American Toad {Bufo americanus} male calling, his vocal sac vibrations causing ripples in the water, Pennsylvania, USA
01213653
Doug Wechsler / American Toad {Bufo americanus} male calling, his vocal sac vibrations causing ripples in the water, Pennsylvania, USA
Siamang Gibbon (Hylobates syndactylus) vocalising, vocal pouch inflated, captive, native to forests of Malaysia, Sumatra and Thailand
01164005
Eric Baccega / Siamang Gibbon (Hylobates syndactylus) vocalising, vocal pouch inflated, captive, native to forests of Malaysia, Sumatra and Thailand
Common tree frog calling, vocal sac inflated, Italy.
01050108
Hans Christoph Kappel / Common tree frog calling, vocal sac inflated, Italy.
Golden oriole {Oriolus oriolus} male displaying, Dauka, Oman
01063177
Hanne & Jens Eriksen / Golden oriole {Oriolus oriolus} male displaying, Dauka, Oman
Grey treefrog vocal sac inflated {Hyla versicolor} Florida, USA
01112542
Barry Mansell / Grey treefrog vocal sac inflated {Hyla versicolor} Florida, USA
Long fingered slender toad {Ansonia longidigita} male vocalising. Borneo , Bentuang-karimun, Indonesia
01084004
Doug Wechsler / Long fingered slender toad {Ansonia longidigita} male vocalising. Borneo , Bentuang-karimun, Indonesia
male Bombay Bubble-nest Frog (Raorchestes bombayensis) calling, vocal sac inflated. Western Ghats, India. Vulnerable species.
01421240
Bert Willaert / male Bombay Bubble-nest Frog (Raorchestes bombayensis) calling, vocal sac inflated. Western Ghats, India. Vulnerable species.
Male Bombay Bubble-nest Frog (Raorchestes bombayensis) calling, vocal sac inflated. Western Ghats, India. Vulnerable species.
01421239
Bert Willaert / Male Bombay Bubble-nest Frog (Raorchestes bombayensis) calling, vocal sac inflated. Western Ghats, India. Vulnerable species.
Male Humayun's Wrinkled Frog (Nyctibatrachus humayuni) calling. Western Ghats, India. Vulnerable species.
01421229
Bert Willaert / Male Humayun's Wrinkled Frog (Nyctibatrachus humayuni) calling. Western Ghats, India. Vulnerable species.
Male Humayun's Wrinkled Frog (Nyctibatrachus humayuni) calling. Western Ghats, India, Vulnerable Species.
01421227
Bert Willaert / Male Humayun's Wrinkled Frog (Nyctibatrachus humayuni) calling. Western Ghats, India, Vulnerable Species.
Pool Frog (Rana lessonae) vocalising at surface, with vocal sacs inflated Danube delta rewilding area, Romania
01415918
Wild Wonders of Europe / Widstrand / Pool Frog (Rana lessonae) vocalising at surface, with vocal sacs inflated Danube delta rewilding area, Romania
RF- Pool Frog (Rana lessonae) vocalising with vocal sacs inflated, Danube delta rewilding area, Romania. (This image may be licensed either as rights managed or royalty free.)
01415915
Wild Wonders of Europe / Widstrand / RF- Pool Frog (Rana lessonae) vocalising with vocal sacs inflated, Danube delta rewilding area, Romania. (This image may be licensed either as rights managed or royalty free.)
RF- Pool Frog (Rana lessonae) sitting on white lily pad, Danube delta rewilding area, Romania. (This image may be licensed either as rights managed or royalty free.)
01415909
Wild Wonders of Europe / Widstrand / RF- Pool Frog (Rana lessonae) sitting on white lily pad, Danube delta rewilding area, Romania. (This image may be licensed either as rights managed or royalty free.)
Male Iberian tree frog (Hyla molleri) calling, vocal sac inflated, Spain, April.
01409151
Bert Willaert / Male Iberian tree frog (Hyla molleri) calling, vocal sac inflated, Spain, April.
Male Iberian tree frog (Hyla molleri) calling, vocal sac inflated, Spain, April.
01409150
Bert Willaert / Male Iberian tree frog (Hyla molleri) calling, vocal sac inflated, Spain, April.
Male Great frigate bird displaying {Fregata minor} Galapagos
01126454
Christophe Courteau / Male Great frigate bird displaying {Fregata minor} Galapagos
Male Great frigate bird in flight, vocal sac visible {Fregata minor} Galapagos.
01126456
Christophe Courteau / Male Great frigate bird in flight, vocal sac visible {Fregata minor} Galapagos.
Male Great frigate bird displaying {Fregata minor} Galapagos.
01126455
Christophe Courteau / Male Great frigate bird displaying {Fregata minor} Galapagos.
California Treefrog (Pseudacris / Hyla cadaverina) vocal sac inflated calling mate, San Pedro Martir National Park, Baja California Peninsula, Mexico, May.
01407776
Claudio Contreras / California Treefrog (Pseudacris / Hyla cadaverina) vocal sac inflated calling mate, San Pedro Martir National Park, Baja California Peninsula, Mexico, May.
Baja California Chorus Frog (Pseudacris hypochondriaca / regilla) vocal sac inflated calling mate while being stung by mosquito, San Pedro Martir National Park, Baja California Peninsula, Mexico, May.
01407775
Claudio Contreras / Baja California Chorus Frog (Pseudacris hypochondriaca / regilla) vocal sac inflated calling mate while being stung by mosquito, San Pedro Martir National Park, Baja California Peninsula, Mexico, May.
Mute swan (Cygnus olor) on snow, Caerlaverock WWT, Scotland, Solway, UK, January. Did you know? Mute swans are not mute - they are just a little less vocal than some other swans.
01392565
Danny Green / 2020VISION / Mute swan (Cygnus olor) on snow, Caerlaverock WWT, Scotland, Solway, UK, January. Did you know? Mute swans are not mute - they are just a little less vocal than some other swans.
Beautiful Pygmy Frog (Microhyla pulchra) inflating vocal sac during breeding season, Bawangling National Nature Reserve, Hainan Island, China.
01391215
Shibai Xiao / Beautiful Pygmy Frog (Microhyla pulchra) inflating vocal sac during breeding season, Bawangling National Nature Reserve, Hainan Island, China.
Common frog (Rana temporaria) with vocal sac inflated, garden pond, Warwickshire, England, UK, March
01394028
Mark Hamblin / 2020VISION / Common frog (Rana temporaria) with vocal sac inflated, garden pond, Warwickshire, England, UK, March
Golden poison dart frog (Phyllobates terribilis) with throat pouch / vocal sacs expanded. Captive occurs Colombia. Endangered species
01391155
Rod Williams / Golden poison dart frog (Phyllobates terribilis) with throat pouch / vocal sacs expanded. Captive occurs Colombia. Endangered species
Tom Aikens, owner of Tom Aikens Restaurant, holding a copy of his Fish recipe book and a 2020VISION promotional book, Tom is a vocal supporter of sustainable fishing practices, Chelsea, London, Englan...
01378740
Toby Roxburgh / 2020VISION / Tom Aikens, owner of Tom Aikens Restaurant, holding a copy of his Fish recipe book and a 2020VISION promotional book, Tom is a vocal supporter of sustainable fishing practices, Chelsea, London, Englan...
Tom Aikens' eponymous Michelin starred restaurant in Chelsea, Tom is a vocal supporter of sustainable fishing practices, London, England, UK, May 2011
01378739
Toby Roxburgh / 2020VISION / Tom Aikens' eponymous Michelin starred restaurant in Chelsea, Tom is a vocal supporter of sustainable fishing practices, London, England, UK, May 2011
Male Southern round gland toad (Incilius / Bufo coccifer) calling, vocal sac inflated, Costa Rica, September
01369767
John Cancalosi / Male Southern round gland toad (Incilius / Bufo coccifer) calling, vocal sac inflated, Costa Rica, September
Male Southern round gland toad, (Incilius / Bufo coccifer) calling, vocal sac inflated, Costa Rica, September
01369764
John Cancalosi / Male Southern round gland toad, (Incilius / Bufo coccifer) calling, vocal sac inflated, Costa Rica, September
Male Cachabi Robber Frog (Pristimantis achatinus) calling, vocal sac inflated. Ecuador, South America.
01363331
Bert Willaert / Male Cachabi Robber Frog (Pristimantis achatinus) calling, vocal sac inflated. Ecuador, South America.
Male Hallowell's Toad (Amietophrynus maculatus / Bufo maculatus) calling with vocal sac inflated. Bobiri Butterfly Sanctuary, Ghana.
01363313
Bert Willaert / Male Hallowell's Toad (Amietophrynus maculatus / Bufo maculatus) calling with vocal sac inflated. Bobiri Butterfly Sanctuary, Ghana.
Male Bombay Bubble-nest Frog (Raorchestes bombayensis) calling, vocal sac inflated. Western Ghats, India.
01363299
Bert Willaert / Male Bombay Bubble-nest Frog (Raorchestes bombayensis) calling, vocal sac inflated. Western Ghats, India.
Male Humayun's Wrinkled Frog (Nyctibatrachus humayuni) calling, vocal sac inflated. Western Ghats, India.
01363295
Bert Willaert / Male Humayun's Wrinkled Frog (Nyctibatrachus humayuni) calling, vocal sac inflated. Western Ghats, India.
Male Common Treefrog (Hyla arborea) calling with inflated vocal sac. France, Europe.
01363290
Bert Willaert / Male Common Treefrog (Hyla arborea) calling with inflated vocal sac. France, Europe.
Male Robber Frog (Pristimantis sp.) calling, vocal sac inflated. Cajas National Park, Ecuador.
01363283
Bert Willaert / Male Robber Frog (Pristimantis sp.) calling, vocal sac inflated. Cajas National Park, Ecuador.
Orange-thighed treefrog (Litoria xanthomera) male calling, vocal sac inflated, in rainforest, Iron Range National Park, Cape York Peninsula, North Queensland, Australia, November
01356757
Konrad Wothe / Orange-thighed treefrog (Litoria xanthomera) male calling, vocal sac inflated, in rainforest, Iron Range National Park, Cape York Peninsula, North Queensland, Australia, November
Marsh Frog (Rana ridibunda) showing prominent vocal sacs. East Sussex, England, April.
01355858
Andy Sands / Marsh Frog (Rana ridibunda) showing prominent vocal sacs. East Sussex, England, April.
Texas Toad (Bufo speciosus) male with calling / vocal sac inflated. Starr County, Rio Grande Valley, Texas, USA.
01352564
B&S Draker / Texas Toad (Bufo speciosus) male with calling / vocal sac inflated. Starr County, Rio Grande Valley, Texas, USA.
Texas Toad (Bufo speciosus) male with calling / vocal sac inflated. Starr County, Rio Grande Valley, Texas, USA.
01352563
B&S Draker / Texas Toad (Bufo speciosus) male with calling / vocal sac inflated. Starr County, Rio Grande Valley, Texas, USA.
Spring Peeper (Pseudacris crucifer) male calling, Connecticut
00476905
Piotr Naskrecki / Spring Peeper (Pseudacris crucifer) male calling, Connecticut
Couch's Spadefoot (Scaphiopus couchii) adult at night calling with vocal sac inflated. Laredo, Webb County, South Texas, USA, April.
01350341
Rolf Nussbaumer / Couch's Spadefoot (Scaphiopus couchii) adult at night calling with vocal sac inflated. Laredo, Webb County, South Texas, USA, April.
Couch's Spadefoot (Scaphiopus couchii) adult at night calling with vocal sac inflated. Laredo, Webb County, South Texas, USA, April.
01350338
Rolf Nussbaumer / Couch's Spadefoot (Scaphiopus couchii) adult at night calling with vocal sac inflated. Laredo, Webb County, South Texas, USA, April.
Couch's Spadefoot (Scaphiopus couchii) adult at night calling with vocal sac inflated. Laredo, Webb County, South Texas, USA, April.
01350342
Rolf Nussbaumer / Couch's Spadefoot (Scaphiopus couchii) adult at night calling with vocal sac inflated. Laredo, Webb County, South Texas, USA, April.
Couch's Spadefoot (Scaphiopus couchii) adult at night calling with vocal sac inflated. Laredo, Webb County, South Texas, USA, April.
01350339
Rolf Nussbaumer / Couch's Spadefoot (Scaphiopus couchii) adult at night calling with vocal sac inflated. Laredo, Webb County, South Texas, USA, April.
Dainty Tree Frog (Litoria gracilenta) calling, Queensland, Australia
00454230
Thomas Marent / Dainty Tree Frog (Litoria gracilenta) calling, Queensland, Australia
Grainy Frog (Kalophrynus sp) calling, Gunung Penrissen, Sarawak, Borneo, Malaysia
00453462
Chien Lee / Grainy Frog (Kalophrynus sp) calling, Gunung Penrissen, Sarawak, Borneo, Malaysia
Masked Rough-sided Frog (Hylarana baramica) calling, Gunung Mulu National Park, Sarawak, Borneo, Malaysia
00453323
Chien Lee / Masked Rough-sided Frog (Hylarana baramica) calling, Gunung Mulu National Park, Sarawak, Borneo, Malaysia
Squirrel Treefrog (Hyla squirella) calling at night, vocal sac inflated, North Florida, USA, August
01313101
Barry Mansell / Squirrel Treefrog (Hyla squirella) calling at night, vocal sac inflated, North Florida, USA, August
Edible Frog (Rana esculenta) calling, Switzerland
00449911
Thomas Marent / Edible Frog (Rana esculenta) calling, Switzerland
Edible Frog (Rana esculenta) calling, Switzerland
00449910
Thomas Marent / Edible Frog (Rana esculenta) calling, Switzerland
Edible Frog (Rana esculenta) calling, Switzerland
00449908
Thomas Marent / Edible Frog (Rana esculenta) calling, Switzerland
European Tree Frog (Hyla arborea) calling, Switzerland
00449888
Thomas Marent / European Tree Frog (Hyla arborea) calling, Switzerland
European Tree Frog (Hyla arborea) calling, Switzerland
00449887
Thomas Marent / European Tree Frog (Hyla arborea) calling, Switzerland
European Tree Frog (Hyla arborea) calling, Switzerland
00449885
Thomas Marent / European Tree Frog (Hyla arborea) calling, Switzerland
European Tree Frog (Hyla arborea) calling, Switzerland
00449883
Thomas Marent / European Tree Frog (Hyla arborea) calling, Switzerland
European Tree Frog (Hyla arborea) calling, Switzerland
00449882
Thomas Marent / European Tree Frog (Hyla arborea) calling, Switzerland
Western chorus frog (Pseudacris triseriata kalmi) male calling, with vocal sac inflated. In vernal pool, Wharton State Forest, Western, USA. March
01318770
Doug Wechsler / Western chorus frog (Pseudacris triseriata kalmi) male calling, with vocal sac inflated. In vernal pool, Wharton State Forest, Western, USA. March
Great Plains Toad (Bufo cognatus) male calling and competing for access to female in amplexus with another male, Touch the Sky Northern Tallgrass Prairie National Wildlife Refuge, southwest Minnesota
00449777
Jim Brandenburg / Great Plains Toad (Bufo cognatus) male calling and competing for access to female in amplexus with another male, Touch the Sky Northern Tallgrass Prairie National Wildlife Refuge, southwest Minnesota
Common tree frog (Hyla arborea) camouflaged in grass, and calling with vocal sac inflated, La Brenne, France
01301319
Philippe Clement / Common tree frog (Hyla arborea) camouflaged in grass, and calling with vocal sac inflated, La Brenne, France
Gulf Coast Toad (Bufo valliceps) vocalizing, Red Corral Ranch, Texas
00442837
Suzi Eszterhas / Gulf Coast Toad (Bufo valliceps) vocalizing, Red Corral Ranch, Texas
Variable Sticky Frog (Kalophrynus heterochirus) calling from a low perch, Borneo, Malaysia
00441506
Chien Lee / Variable Sticky Frog (Kalophrynus heterochirus) calling from a low perch, Borneo, Malaysia
Bornean Tree-hole Frog (Metaphrynella sundana) male calling for a mate from its lair, Lambir Hills National Park, Borneo, Malaysia
00441454
Chien Lee / Bornean Tree-hole Frog (Metaphrynella sundana) male calling for a mate from its lair, Lambir Hills National Park, Borneo, Malaysia
Painted Treefrog (Tlalocohyla picta) calling, Calakmul Biosphere Reserve, Mexico
00438673
Kevin Schafer / Painted Treefrog (Tlalocohyla picta) calling, Calakmul Biosphere Reserve, Mexico
European green toads (Bufo viridis) mating with male calling, vocal sac inflated, in a pond (2,711m above sea level) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008
01242174
Wild Wonders of Europe / Schandy / European green toads (Bufo viridis) mating with male calling, vocal sac inflated, in a pond (2,711m above sea level) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008
European green toad (Bufo viridis) calling, vocal sac inflated, in a pond (at 2,711m) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008
01242177
Wild Wonders of Europe / Schandy / European green toad (Bufo viridis) calling, vocal sac inflated, in a pond (at 2,711m) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008
European green toad (Bufo viridis) calling, vocal sac inflated in a pond (at 2,711m) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008
01242179
Wild Wonders of Europe / Schandy / European green toad (Bufo viridis) calling, vocal sac inflated in a pond (at 2,711m) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008
European green toad (Bufo viridis) calling, vocal sac inflated, in a pond (at 2,711m) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008
01242173
Wild Wonders of Europe / Schandy / European green toad (Bufo viridis) calling, vocal sac inflated, in a pond (at 2,711m) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008
American Toad (Bufo americanus), male calling to attract female, vocal sac inflated, NY, USA
01240199
John Cancalosi / American Toad (Bufo americanus), male calling to attract female, vocal sac inflated, NY, USA
Spring Peeper tree frog (Pseudacris crucifer / Hyla crucifer) male calling to attract female, vocal sac inflated, NY, USA
01240197
John Cancalosi / Spring Peeper tree frog (Pseudacris crucifer / Hyla crucifer) male calling to attract female, vocal sac inflated, NY, USA
Spring Peeper tree frog (Pseudacris crucifer / Hyla crucifer) male calling to attract female, vocal sac inflated, NY, USA
01240196
John Cancalosi / Spring Peeper tree frog (Pseudacris crucifer / Hyla crucifer) male calling to attract female, vocal sac inflated, NY, USA
American Toad (Bufo americanus), Male calling to attract female, vocal sac inflated, NY, USA
01240200
John Cancalosi / American Toad (Bufo americanus), Male calling to attract female, vocal sac inflated, NY, USA
Sonoran Green Toad (Bufo retiformis) male vocalizing, North America
00423269
Michael & Patricia Fogden / Sonoran Green Toad (Bufo retiformis) male vocalizing, North America
Great Plains Toad (Bufo cognatus) male calling, native to North America
00423268
Michael & Patricia Fogden / Great Plains Toad (Bufo cognatus) male calling, native to North America
American Toad {Bufo americanus} male calling, vocal sac inflated, Valley Forge NP, Pennsylvania, USA
01213652
Doug Wechsler / American Toad {Bufo americanus} male calling, vocal sac inflated, Valley Forge NP, Pennsylvania, USA
American Toad {Bufo americanus} male calling, vocal sac inflated, Pennsylvania, USA
01213654
Doug Wechsler / American Toad {Bufo americanus} male calling, vocal sac inflated, Pennsylvania, USA
Two Siamang Gibbons (Hylobates / Symphalangus syndactylus) calling, vocal pouches inflated, Endangered, captive, from SE Asia
01210051
Eric Baccega / Two Siamang Gibbons (Hylobates / Symphalangus syndactylus) calling, vocal pouches inflated, Endangered, captive, from SE Asia
RF- Male Rainforest Treefrog (Gephyromantis sp.) calling at night. Ranomafana National Park, SE Madagascar. (This image may be licensed either as rights managed or royalty free.)
01208908
Nick Garbutt / RF- Male Rainforest Treefrog (Gephyromantis sp.) calling at night. Ranomafana National Park, SE Madagascar. (This image may be licensed either as rights managed or royalty free.)
Lesser Prairie-Chicken {Tympanuchus pallidicinctus} male displaying with vocal sac inflated, Panhandle, Texas, USA, February 2006
01187396
Rolf Nussbaumer / Lesser Prairie-Chicken {Tympanuchus pallidicinctus} male displaying with vocal sac inflated, Panhandle, Texas, USA, February 2006
Frog {Manditactylus granulatus} showing twin vocal sacs, Madagascar
01059694
Pete Oxford / Frog {Manditactylus granulatus} showing twin vocal sacs, Madagascar
Marsh frog (Rana ridibunda perezii) male vocalising at water surface clearly showing vocal sacs, Spain
01186303
Jose B. Ruiz / Marsh frog (Rana ridibunda perezii) male vocalising at water surface clearly showing vocal sacs, Spain
Gulf Coast Toad {Bufo valliceps} male calling at night, vocal sac inflated, Hill Country, Texas, USA
01174268
Rolf Nussbaumer / Gulf Coast Toad {Bufo valliceps} male calling at night, vocal sac inflated, Hill Country, Texas, USA
Gulf Coast Toad {Bufo valliceps} male calling at night, vocal sac inflated, Hill Country, Texas, USA
01174267
Rolf Nussbaumer / Gulf Coast Toad {Bufo valliceps} male calling at night, vocal sac inflated, Hill Country, Texas, USA
Gulf Coast Toad {Bufo valliceps} male calling at night, vocal sac inflated, Hill Country, Texas, USA
01174266
Rolf Nussbaumer / Gulf Coast Toad {Bufo valliceps} male calling at night, vocal sac inflated, Hill Country, Texas, USA
Cliff Chirping Frog {Eleutherodactylus marnockii} male at night calling with vocal sac inflated, Hill Country, Texas, USA
01174178
Rolf Nussbaumer / Cliff Chirping Frog {Eleutherodactylus marnockii} male at night calling with vocal sac inflated, Hill Country, Texas, USA
Fowler's toad {Bufo woodhousii fowleri} male vocalising, vocal sacs inflated, Delaware, USA
01158873
Doug Wechsler / Fowler's toad {Bufo woodhousii fowleri} male vocalising, vocal sacs inflated, Delaware, USA
RF- Western green toad (Bufo debilis) male calling, vocal sac inflated. Chiricahua Mountains, Arizona, USA. (This image may be licensed either as rights managed or royalty free.)
01140659
Rolf Nussbaumer / RF- Western green toad (Bufo debilis) male calling, vocal sac inflated. Chiricahua Mountains, Arizona, USA. (This image may be licensed either as rights managed or royalty free.)
Common tree frog calling {Hyla arborea} vocal sac inflated, Sardinia
01050107
Hans Christoph Kappel / Common tree frog calling {Hyla arborea} vocal sac inflated, Sardinia
Crested toad showing vocal sac {Bufo typhonius} Amazon rainforest, Ecuador
01075810
Pete Oxford / Crested toad showing vocal sac {Bufo typhonius} Amazon rainforest, Ecuador
American toad calling, vocal sac inflated {Bufo americanus} USA.
01061607
Thomas Lazar / American toad calling, vocal sac inflated {Bufo americanus} USA.
Common African Toad (Bufo regularis) male calling at night, vocal sacs inflated. Keny
01132433
Jane Burton / Common African Toad (Bufo regularis) male calling at night, vocal sacs inflated. Keny
RF- European edible frog male vocal sacs inflated (Rana esculenta) UK, captive. (This image may be licensed either as rights managed or royalty free.)
01132321
Kim Taylor / RF- European edible frog male vocal sacs inflated (Rana esculenta) UK, captive. (This image may be licensed either as rights managed or royalty free.)
Darwin's Frog (Rhinoderma darwinii) male on forest floor with vocal sac full of young, austral Beech forest, Chiloe Island, Chile
00511322
Michael & Patricia Fogden / Darwin's Frog (Rhinoderma darwinii) male on forest floor with vocal sac full of young, austral Beech forest, Chiloe Island, Chile
Darwin's Frog (Rhinoderma darwinii) male with froglets, in vocal sac, austral rainforest, Chiloe Island, Chile
00510356
Michael & Patricia Fogden / Darwin's Frog (Rhinoderma darwinii) male with froglets, in vocal sac, austral rainforest, Chiloe Island, Chile