Franco Banfi / Bladder wrack (Fucus sp) exposed at low tide. Vrangel Bay, Primorsky Krai, Russia. August.

Franco Banfi / Bladder wrack (Fucus sp) exposed at low tide. Vrangel Bay, Primorsky Krai, Russia. August.

Nick Upton / Bladder wrack (Fucus vesiculosus) frond from Atlantic Ocean, Cornwall, England, UK. September.

Sue Daly / Bladder wrack (Fucus vesiculosus), Herm, British Channel Islands, June.

Chris Mattison / Bladder wrack (Fucus vesiculosus) Salen, Mull, Scotland, UK, June.

Solvin Zankl / Bladder wrack (Fucus vesiculosus) from Roscoff, France, April. Preserved specimen.

Solvin Zankl / Bladder wrack (Fucus vesiculosus) from Roscoff, France. Preserved specimen.

Solvin Zankl / Bladder wrack (Fucus vesiculosus) Purbeck Marine Wildlife Reserve, Kimmeridge Bay, Dorset, UK, July.

Solvin Zankl / Bladder wrack (Fucus vesiculosus) Purbeck Marine Wildlife Reserve, Kimmeridge Bay, Dorset, UK, July.

Alex Hyde / Bladder Wrack (Fucus vesiculosus) and Channelled Wrack (Pelvetia canaliculata) exposed at low tide in middle-shore zone. Isle of Mull, Scotland, UK. June.

Alex Hyde / Channelled Wrack (Pelvetia canaliculata), Bladder Wrack (Fucus vesiculosus) and Spiral Wrack (Fucus spiralis) seaweeds, exposed at low tide in upper-shore zone. Isle of Mull, Scotland, UK. June.

Chris Mattison / Small bladder wrack plant (Fucus vesiculosus) growing on bare rock, Northumberland, England, UK, May.

Chris Mattison / Bladder wrack (Fucus vesiculosus) on sea shore, Northumberland, England, UK, May.

Nick Upton / Bladder wrack (Fucus vesiculosus) growing on mudflats on the Severn estuary, Somerset, UK, September.

MYN / Carsten Krieger / Bladder Wrack (Fucus vesiculosus) from rock pool, County Clare, Republic of Ireland. December. Meetyourneighbours.net project

Nick Upton / Egg masses of Common whelk (Buccinum undatum) washed up on high water mark alongside dried out Bladder wrack fronds (Fucus vesiculosus), Rhossili, The Gower peninsula, Wales, UK, June.

Nick Upton / Bladder wrack (Fucus vesiculosus) with many air bladders growing low on a rocky shore, Lyme Regis, Dorset, UK, May.

Adrian Davies / Bladder wrack (Fucus vesiculosis), Devon, England, UK, August.

Nick Upton / Turnstones (Arenaria interpres) foraging among pebbles and Bladder wrack (Fucus vesiculosus) on a falling tide, Severn estuary, Somerset, UK, March.

Orsolya Haarberg / Different algaes and seaweeds, including Bladder wrack (Fucus vesiculosus), laying on a beach, covered by snow, Nesna, Helgeland, Norway. February.

Konrad Wothe / Bladder wrack (Fucus vesiculosus) in intertidal zone, Atlantic Ocean, Republic of Ireland. August.

Alex Mustard / Seaweed including Bladder wrack (Fucus vesiculosus) egg wrack (Ascophyllum nodosum; serrated wrack (Fucus serratus) grows around the edge of a rockpool. Looe, Cornwall, England, United Kingdom. Englis...

Yashpal Rathore / Blue-eyed bush frog (Raorchestes luteolus), tiny frog with beautiful blue iris, vocal sac inflated. Coorg, Karnataka, India. Endemic to Western Ghats.

Yashpal Rathore / Blue-eyed Bush frog (Raorchestes luteolus), tiny frog with blue iris, vocal sac inflated. Coorg, Karnataka, India. Endemic to Western Ghats. June.

Yashpal Rathore / Jayarami bush frog (Raorchestes jayarami), inflating vocal sac, calling to attract mate, Endemic to Western Ghats. Anamalai Wildlife Sanctuary, India.

Yashpal Rathore / Jayarami Bush frog (Raorchestes jayarami), inflating vocal sac, calling to attract mate, Anamalai Wildlife Sanctuary, India. Endemic to Western Ghats.

Yashpal Rathore / Jayarami Bush frog (Raorchestes jayarami), inflating vocal sac, calling to attract mate, Endemic to Western Ghats. Anamalai Wildlife Sanctuary, India.

Hanne & Jens Eriksen / Egyptian tomb bat (Taphozous perforatus) roosting, Oman, November

Juergen Freund / Bird-dropping spider (Celaenia excavata) on egg sac, Queensland, Australia.

Nick Hawkins / Red-eyed treefrog (Agalychnis calidryas) calling, vocal sac inlated, Tortuguero National Park, Costa Rica.

Nick Hawkins / Proboscis bats (Rhynchonycteris naso) day roosting, Costa Rica, March 2014.

Nick Hawkins / Proboscis bats (Rhynchonycteris naso) day roosting, Costa Rica, March 2014.

Cyril Ruoso / Frog (Pelophylax sp) calling with vocal sacs inflated. Burgundy, France, May.

Cyril Ruoso / Frog (Pelophylax sp) calling with vocal sacs inflated. Burgundy, France, May.

Cyril Ruoso / Common tree frog (Hyla arborea) male calling at night with inflated vocal sac. Burgundy, France, April.

Cyril Ruoso / Common tree frog (Hyla arborea) male calling at night with inflated vocal sac. Burgundy, France, April.

Cyril Ruoso / Common tree frog (Hyla arborea) pair in amplexus, Burgundy. France, April.

Cyril Ruoso / Common tree frog (Hyla arborea) male calling at night with inflated vocal pouch. Burgundy, France, April.

Alex Mustard / Mimic octopus (Thaumoctopus mimicus) mating/courtship. The smaller male is riding on top of the female as he tries to place his sperm sac inside her mantle with his arm. Lembeh Strait, Sulawesi, Indon...

Cyril Ruoso / Pacific tree frog (Pseudacris regilla) male calling with vocal sac inflated, Conboy Lake National Wildlife Refuge, Washington, USA. March.

Cyril Ruoso / Pacific tree frog (Pseudacris regilla) male calling with vocal sac inflated, Conboy Lake National Wildlife Refuge, Washington, USA. March.

Cyril Ruoso / Pacific tree frog (Pseudacris regilla) male calling with vocal sac inflated, Conboy Lake National Wildlife Refuge, Washington, USA. March.

Cyril Ruoso / Pacific tree frog (Pseudacris regilla) male calling with vocal sac inflated, Conboy Lake National Wildlife Refuge, Washington, USA. March.

Jim Brandenburg / Northern Leopard Frog (Rana pipiens) camouflaged in lichen, Minnesota

Jim Brandenburg / Cliff with lichen, Judd Lake, Superior National Forest, Minnesota

Pete Oxford / Lichen on rock near volcano, Cotopaxi Volcano, Cotopaxi National Park, Andes, Ecuador

Sean Crane / Orange lichen covered rocks along coast, Wineglass Bay, Freycinet National Park, Tasmania, Australia

Sean Crane / Orange lichen covered rocks along coast, Wineglass Bay, Freycinet National Park, Tasmania, Australia

Sean Crane / Orange lichen covered rocks along coast, Wineglass Bay, Freycinet National Park, Tasmania, Australia

Sean Crane / Orange lichen covered rocks along coast, Wineglass Bay, Freycinet National Park, Tasmania, Australia

Nick Upton / Female Walnut orb-weaver spider (Nuctenea umbratica) guarding her egg sac on an old fence post, Wiltshire, UK, June.

Nick Upton / Female Walnut orb-weaver spider (Nuctenea umbratica) guarding her egg sac on an old fence post, Wiltshire, UK, June.

Nick Upton / Female Walnut orb-weaver spider (Nuctenea umbratica) guarding her egg sac on an old fence post, Wiltshire, UK, June.

Tim Fitzharris / Mount Hayden from Point Imperial, North Rim, Grand Canyon National Park, Arizona

Tim Fitzharris / Lichen on rocks, Mount Scott, Wichita Mountains National Wildlife Refuge, Oklahoma

Jussi Murtosaari / Raft spider (Dolomedes fimbriatus), female carrying egg sac, Toivakka, Finland, August.

Konrad Wothe / Yellow Morel (Morchella esculenta) mushroom in forest, Upper Bavaria, Germany

Konrad Wothe / Blue Tit (Cyanistes caeruleus) parent collecting fecal sac in nest box, Bavaria, Germany

Melvin Grey / Marsh frog (Rana ridibunda) male with inflated vocal sacs. Bulgaria. May.

Alex Hyde / Running crab spider (Philodromus sp.) female guarding egg sac. Arne RSPB reserve, Dorset, UK. August.

Roland Seitre / Black-bearded tomb bat (Taphozous melanopogon) two hanging from ceiling in Prasat Preah Kahn temple, Angkor complex, Siem Reap, Cambodia.

Roland Seitre / Black-bearded tomb bat (Taphozous melanopogon) hanging upside down, Siem Reap, Angkor Vat, Cambodia.

Roland Seitre / Theobold's bat (Taphozous theobaldi) colony roosting in walls in temple, Siem Reap, Angkor Vat, Cambodia.

Colin Monteath/ Hedgehog House / Moss and lichen covered boulder, Mungo River, New Zealand

Thomas Marent / Gelada Baboon (Theropithecus gelada) juvenile feeding on lichen, Simien Mountains National Park, Ethiopia

Thomas Marent / Gelada Baboon (Theropithecus gelada) young, Simien Mountains National Park, Ethiopia

Thomas Marent / Gelada Baboon (Theropithecus gelada) young feeding on lichen, Simien Mountains National Park, Ethiopia

Chris Mattison / Comb-footed spider (Enoplognatha ovata) female guarding egg-sac in rolled-over oak leaf, South Yorkshire, England, UK, December. September. Focus-stacked image

Pete Oxford / Silver Marsupial Frog (Gastrotheca plumbea) calling, Chimborazo Volcano, Andes, Ecuador

Pete Oxford / Pichincha Poison Arrow Frog (Oophaga sylvatica) calling, native to South America

Dong Lei / Puer tree frog (Rhacophorus puerensis) male calling, Gaoligong Mountain National Nature Reserve, Tengchong county, Yunnan Province, China. May.

Konrad Wothe / Spider (Clubionidae) with legs stretched out straight, Panguana Reserve, Huanuco province, Amazon basin, Peru.

Konrad Wothe / Frog (Pristimantis peruvianus) calling with vocal sac inflated, Panguana Reserve, Huanuco province, Amazon basin, Peru.

Konrad Wothe / Frog (Pristimantis peruvianus) calling, Panguana Reserve, Huanuco province, Amazon basin, Peru.

Konrad Wothe / Brilliant thighed poison frog (Allobates femoralis) calling, with vocal pouch inflated. Panguana Reserve, Huanuco province, Amazon basin, Peru.

Konrad Wothe / Brilliant thighed frog (Allobates femoralis) croacking, Panguana Reserve, Huanuco province, Amazon basin, Peru.

Konrad Wothe / Brilliant-thighed poison frog (Allobates femoralis) calling with vocal sac inflated. Panguana Reserve, Huanuco province, Amazon basin, Peru.

Pete Oxford / Magnificent frigatebird (Fregata magnificens) male with pouch inflated. Galapagos.

Gabriel Rojo / Green-barred woodpecker (Colaptes melanochloros) male emerging from nest hole with fecal sac, La Pampa, Argentina

Loic Poidevin / Redwing (Turdus iliacus) removing faecal sac from nest, Finland, April.

Chien Lee / Asian Horned Frog (Megophrys nasuta) calling, Malaysia

Chien Lee / Fungus (Ophiocordyceps sp) growing from Ant (Polyrhachis ypsilon), Danum Valley Field Center, Sabah, Borneo, Malaysia

Konrad Wothe / Spider (Trechalea sp) with egg sac, Panguana Nature Reserve, Peru

Ammonite / Ashy mining bee (Andrena cineraria) with full pollen baskets / sacs, Bristol, England, UK, May.

Phil Savoie / European honey bee (Apis mellifera) with full pollen sacs returning to the hive, Monmouthshire, Wales, UK. September.

Phil Savoie / European honey bee (Apis mellifera) with full pollen sacs returning to the hive, Monmouthshire, Wales, UK. September.

Phil Savoie / European honey bee (Apis mellifera) with full pollen sacs returning to the hive, Monmouthshire, Wales, UK. September.

Pete Oxford / Long-nosed Bats (Rhynchonycteris naso) roosting, Yasuni National Park, Amazon Rainforest, Ecuador, South America.

Phil Savoie / European honey bees (Apis mellifera) with full pollen sacs in flight, Monmouthshire, Wales, UK. September.

Phil Savoie / European honey bees (Apis mellifera) with full pollen sacs returning to the hive, Monmouthshire, Wales, UK. September.

Phil Savoie / European honey bees (Apis mellifera) with full pollen sacs returning to the hive, Monmouthshire, Wales, UK. September.

Phil Savoie / Shrill Carder Bee (Bombus sylvarum), England's rarest species, with pollen sacs, feeding on ice plant flowers (Sedum spectabile), Monmouthshire, Wales, UK. September.

Phil Savoie / Shrill Carder Bee (Bombus sylvarum), England's rarest species, with pollen sacs, feeding on ice plant flowers (Sedum spectabile), Monmouthshire, Wales, UK. September.

Phil Savoie / Shrill Carder Bee (Bombus sylvarum), England's rarest species, with pollen sacs, feeding on ice plant flowers (Sedum spectabile), Monmouthshire, Wales, UK. September.

Phil Savoie / Shrill Carder Bee (Bombus sylvarum), England's rarest species, with pollen sacs feeding on ice plant flowers (Sedum spectabile), Monmouthshire, Wales, UK. September.

Phil Savoie / Shrill Carder Bee (Bombus sylvarum), England's rarest species, with pollen sacs feeding on ice plant flowers (Sedum spectabile), Monmouthshire, Wales, UK. September.

James Christensen / Anyphaenid Sac Spider (Anyphaenidae) female, Hacienda San Vicente, Mindo, Ecuador

Hanne & Jens Eriksen / Arabian toad (Duttaphrynus arabicus / Bufo arabicus) calling with vocal sac inflatedl, Oman, April.

Kim Taylor / White-tailed bumblebee (Bombus lucorum) worker with full pollen sacs visiting Borage (Borago officinalis) flower. Surrey, England, July.

Kim Taylor / White-tailed bumblebee (Bombus lucorum) worker with full pollen sacs visiting Borage (Borago officinalis) flower. Surrey, England, July.

Alex Hyde / Egg sac of a Pirate Spider (Ero sp.). Peak District National Park, Derbyshire, UK. April.

Alex Hyde / Nursery Web Spider (Pisaura mirabilis) female carrying egg sac, against a white background. Peak District National Park, Derbyshire, UK. June.

Phil Savoie / Mining bee (Andrena sp) covered in pollen, feeding on Lesser celandine (Ranunculus ficaria). Monmouthshire, Wales, UK, March.

Phil Savoie / Mining bee (Andrena sp) covered in pollen, feeding on Wild strawberry (Fragaria vesca). Monmouthshire, Wales, UK, March.

Phil Savoie / European honey bee (Apis mellifera) in flight, feeding on flowers (Brachyglottis sp). Monmouthshire, Wales, UK, June.

Phil Savoie / European honey bee (Apis mellifera) in flight, feeding on flowers (Brachyglottis sp). Monmouthshire, Wales, UK, June.

Chien Lee / Huntsman Spider (Heteropoda sp) female clutching her egg sac, Lubang Buaya, Batang Ai National Park, Malaysia

John Abbott / Common Eastern Bumble Bee (Bombus impatiens) worker in flight with pollen sacs, Camp Maxey National Guard Facility, Paris, Lamar County, Texas, USA.

Bert Willaert / Male Common treefrog (Hyla arborea) calling from the water surface, Belgium. April.

Luiz Claudio Marigo / Long-nosed Bats (Rhynchonycteris naso) resting on a tree,Tres Irmaos River, Pantanal, Mato Grosso, Mato Grosso State, Western Brazil.

Luiz Claudio Marigo / Long-nosed Bats (Rhynchonycteris naso) resting on tree, Tres Irmaos River, Pantanal, Mato Grosso, Mato Grosso State, Western Brazil.

Roland Seitre / Yellow-bellied Sheathtailed Bat (Saccolaimus flaviventris) portrait, captive at Tolga Bat Hospital, Atherton, Queensland, Australia.

Roland Seitre / Yellow-bellied Sheathtailed Bat (Saccolaimus flaviventris) portrait, captive at Tolga Bat Hospital, Atherton, Queensland, Australia.

Roland Seitre / Yellow-bellied Sheathtailed Bat (Saccolaimus flaviventris) portrait, captive at Tolga Bat Hospital, Atherton, Queensland, Australia.

Michel Roggo / Underwater landscape of the Cenote Sac-Actun, Quintana Roo, Yucatan Peninsula, Mexico, February 2014 Taken for the Freshwater Project.

D. Parer & E. Parer-Cook / Golden Bowerbird (Prionodura newtoniana) male at bower decorated with lichen and flowers, Atherton Tableland, Queensland, Australia

D. Parer & E. Parer-Cook / Golden Bowerbird (Prionodura newtoniana) bower with lichen decoration, Atherton Tableland, Queensland, Australia

Alex Hyde / Mother Care Spider (Theridion sisyphium) female guarding egg sac. When the spiderlings hatch, the mother feeds them regurgitated food. Peak District National Park, Derbyshire, UK. August.