Bruce Thomson / Male Striped burrowing frog (Cyclorana alboguttata) calling, Cunnamulla, Queensland, Australia.
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Ripan Biswas / Darjeeling bush frog (Raorchestes annandalii) croaking, sitting on a leaf, Kalimpong, West Bengal, India.
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Ripan Biswas / Two male Darjeeling bush frogs (Raorchestes annandalii) fighting over territory, Kalimpong, West Bengal, India.
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Ripan Biswas / Two male Darjeeling bush frog (Raorchestes annandalii) croaking at night to warn off intruders to their territory, Kalimpong, West Bengal, India.
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Ripan Biswas / Two male Darjeeling bush frogs (Raorchestes annandalii) fighting over territory, Kalimpong, West Bengal, India.
01689839
Ripan Biswas / Darjeeling bush frog (Raorchestes annandalii) croaking, showing inflated vocal sac, Kalimpong, West Bengal, India.
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Ripan Biswas / Darjeeling bush frog (Raorchestes annandalii) croaking, sitting on rose bud, Kalimpong, West Bengal, India.
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Ripan Biswas / Darjeeling bush frog (Raorchestes annandalii) croaking, showing inflated vocal sac, Kalimpong, West Bengal, India.
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Ripan Biswas / Darjeeling bush frog (Raorchestes annandalii) croaking, sitting on a petal, Kalimpong, West Bengal, India.
01687504
Gerrit Vyn / Greater Prairie-Chicken (Tympanuchus cupido) male displaying on lek. Fort Pierre National Grassland, South Dakota, USA. When displaying, the males erect earlike plumes on the head and blow up bright o...
01683552
Bruce Thomson / Broad palmed rocket frog (Litoria latopalmata) male calling near edge of small pool after rain, Esk, Queensland, Australia.
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Bruce Thomson / Green thighed frog (Litoria brevipalmata) male calling near shallow pool at night after rain, Conondale, Queensland, Australia.
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Bruce Thomson / Dainty green tree frog (Litoria gracilenta) male calling from stem over shallow pond, Esk, Queensland, Australia
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Bruce Thomson / Tylers tree frog (Litoria tyleri) on branch in low shrub over water at night, Gold Coast, Queensland, Australia.
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Bruce Thomson / Perons / Emerald spotted tree frog (Litoria peronii) sitting on rock calling at night, vocal sac inflated, near water, common in eastern Australia, Southport, Queensland, Australia.
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Etienne Littlefair / Northern spadefoot (Notaden melanoscaphus) adult male with vocal sac inflated, calling, Howard River sand flats, Northern Territory, Australia, January.
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Etienne Littlefair / Northern spadefoot (Notaden melanoscaphus) adult male with vocal sac inflated, calling, Howard River sand flats, Northern Territory, Australia, January.
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Etienne Littlefair / Northern spadefoot (Notaden melanoscaphus) adult male with vocal sac inflated, calling, Howard River sand flats, Northern Territory, Australia, January.
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Etienne Littlefair / Northern spadefoot (Notaden melanoscaphus) adult male with vocal sac inflated, calling, Howard River sand flats, Northern Territory, Australia, January.
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Morley Read / Short-headed treefrog (Dendropsophus brevifrons) calling with inflated vocal sac. Above a rainforest pond at night, Yasuni National Park, Ecuador.
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Eric Baccega / Edible frog (Rana esculenta), male in pond croaking, vocalising, calling with vocal sacs inflated, France
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Eric Baccega / Edible frog (Rana esculenta), male in pond croaking, vocalising, calling with vocal sacs inflated, France
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Nick Garbutt / RF - European marsh frog (Pelophylax ridibundus), two males calling during breeding season, throat sacs inflated. Danube Delta, Romania. May. (This image may be licensed either as rights managed or ro...
01661365
Ingo Arndt / Rear view of a Honey bee (Apis mellifera), with corbicula (pollen sacs) full of pollen, Germany. May.
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Ingo Arndt / Honey bee (Apis mellifera) with corbicula (pollen sacs) full of pollen, Germany.
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Emanuele Biggi / Stripeless tree frog (Hyla meridionalis), male calling by a pond at night, Languedoc Roussillon, France.
01660039
Jussi Murtosaari / Honey bee (Apis mellifera) with laden pollen sacs flying towards Pussy willow (Salix caprea) catkins. Jyvaskyla, Central Finland. April.
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Pascal Pittorino / Five Mediterranean tree frogs (Hyla meridionalis) with inflated vocal sacs calling at night in a pond, Provence, Var, France, December
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John Cancalosi / American toad (Bufo americanus) male calling to attract female, New York, USA
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David Hall / Split level shot of kelp and other 'seaweeds' partly exposed at low tide, with coniferous forest in the background. Seen in this photograph are the following: Turkish washcloth (Mastocarpus pa...
01651562
Tui De Roy / Great frigatebird (Fregata minor) in tree with pair of Nazca boobies (Sula granti) showing mating behaviour, Genovesa Island, Galapagos,
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Nick Upton / Yellow swarming fly / Chloropid fly (Thaumatomyia notata) male releasing sex pheromones from everted abdominal scent sacs, Wiltshire garden, April.
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Nick Upton / Buff-tailed bumblebee (Bombus terrestris) queen about to land at her nest burrow in a garden lawn with loaded pollen sacs to provision grubs that will become future workers for her colony, Wiltshire,...
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Nick Upton / Buff-tailed bumblebee (Bombus terrestris) queen returning to her nest burrow in a garden lawn with full pollen sacs to provision grubs that will become future workers for her colony, Wiltshire, UK, Ap...
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Dave Bevan / Pair of Grey wagtails (Motacilla cinerea) feeding nestlings and removing faecal sacs before flying out of frame, Carmarthenshire, Wales, UK, June.
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Jussi Murtosaari / Edible frog (Rana esculenta), male in pond croaking, vocal sacs inflated, Finland, May.
