Shane Gross / Caribbean spiny lobster (Panulirus argus), two in territorial fight in coral reef. Exuma Cays Land and Sea Park, marine protected area, Bahamas.

Shane Gross / Nocturnal Caribbean spiny lobster (Panulirus argus) at night crawling in the Seagrass (Thalassia testudinum) looking for food. Eleuthera, Bahamas.

Alex Mustard / Caribbean spiny lobster (Panulirus argus) emerges onto a coral reef in late afternoon. East End, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Robert Thompson / Lichen (Ochrolechia parella) Ballywhoriskey Point, County Donegal, Northern Ireland. October.

Guy Edwardes / Crawfish lichen (Ochrolechia parella) on a gravestone, Unst, Shetland Islands, Scotland, August.

Chris Mattison / Crawfish lichen (Ochrolechia parella) growing on a headstone. Gower, South Wales, UK.

Chris Mattison / Crab eye lichen (Ochrolechia parella) on headstone, Gower, South Wales, UK, June.

Chris Mattison / Two lichens on a headstone, Grab eye lichens (Ocrolechia parella) - pale grey, and Rusty shielded lichen (Caloplaca crenularia) Gower, South Wales, UK, June.

Pascal Kobeh / Caribbean spiny lobster (Panulirus argus) in a giant barrel sponge (Xestospongia muta), San Salvador Island / Colombus Island, Bahamas. Caribbean.

Pascal Kobeh / Caribbean spiny lobster (Panulirus argus) in Giant barrel sponge (Xestospongia muta), San Salvador Island / Colombus Island, Bahamas. Caribbean.

MYN / Clay Bolt / Crawfish or Crayfish Chimney in bayou wetlands, Jean Lafitte National Park, Louisiana, United States, May. Meetyourneighbours.net project

Pete Oxford / Gopher Frog (Rana capito), Orianne Indigo Snake Preserve, Georgia

Adrian Davies / Lichens including Xanthoria parietina and Ochrolechia parella on tombstones in village churchyard. Slapton, Devon, England, UK, July 2013.

Sue Daly / Crawfish / Spiny Lobster (Palinurus elephas). L'Etac, Sark, British Channel Islands, August.

Sue Daly / Spiny lobster / Crawfish (Palinurus elephas) sheltering under rock, Channel Islands, UK June

Adrian Davies / Lichen (Ochrolecia parella) on wall of church, Devon, UK, August

B&S Draker / Northern Raccoon (Procyon lotor) adult in water eating Crayfish / Crawfish (Astacidae). Sinton, Corpus Christi, Coastal Bend, Texas, USA, May.

John Cancalosi / Red Louisiana Swamp Crawfish / Crayfish (Procambarus clarkii) with its claws up in a defensive display. Important commercial food item, native to Southeastern US. Louisiana, USA, April.

John Cancalosi / Red Swamp Crawfish / Crayfish (Procambarus clarkii) raising its claws in a defensive posture. Louisiana, USA. April. Important commercial food item.

John Cancalosi / Red Swamp Crawfish / Crayfish (Procambarus clarkii) raising its claws in a defensive posture. Louisiana, USA, April. Important commercial food item.

John Cancalosi / Red Swamp Crawfish / Crayfish (Procambarus clarkii) at water edge. Louisiana, USA, April. Important commercial food item.

John Cancalosi / Red Swamp Crawfish / Crayfish (Procambarus clarkii) at water edge. Louisiana, USA, April. Important commercial food item.

John Cancalosi / Red Swamp Crawfish / Crayfish (Procambarus clarkii) at water edge. Louisiana, USA, April. Important commercial food item.

John Cancalosi / Red Swamp Crawfish / Crayfish (Procambarus clarkii) at water edge. Louisiana, USA, April. Important commercial food item.

Nature Production / Red / Louisianna swamp crayfish (Procambarus / Scapulicambarus clarkii) feeding on waterweed, Japan, August

Nature Production / Red / Louisianna swamp crayfish (Procambarus / Scapulicambarus clarkii) two males fighting, Fukuoka, Japan, March

Nature Production / Red / Louisianna swamp crayfish (Procambarus / Scapulicambarus clarkii) mating pair, Fukuoka, Japan, March

Adrian Davies / Crawfish Lichen (Ochrolechia parrella) Devon, England

Ross Hoddinott / Crab's-eye / Crawfish lichen {Ochrolechia parella} close-up, Devon, UK. September.

Barry Mansell / Male Burrowing crayfish (Procambarus rogersi campestris) Wakulla County, Florida, USA

Barry Mansell / Male Burrowing crayfish (Procambarus rogersi rogersi) Wakula County, West Florida, USA

Barry Mansell / Female Crayfish (Cambarellus / Panicambarus blacki) found in a small pond, Escambia county, West Florida, USA

Barry Mansell / Cave crayfish (Procambarus horsti) endemic to the Leon county area of Florida, found only in sinks or springs leading to underground aquifer, West Florida, USA

Barry Mansell / Red-eyed Cave Crayfish (Procambarus erythrops) from an underground aquifer, Sims Sink, Swannee County, Florida, species of special concern, USA, Blind but with non-functional eye-spots that control...

Barry Mansell / Woodville karst cave crayfish (Procambarus orcinus) on rock, a blind crayfish, from an underground aquifer, Leon County, Florida, USA

Barry Mansell / Red-eyed Cave Crayfish (Procambarus erythrops) from an underground aquifer, Sims Sink, Swannee County, Florida, species of special concern, USA, Blind but with non-functional eye-spots that control...

Barry Mansell / Red-eyed Cave Crayfish (Procambarus erythrops) from an underground aquifer, Sims Sink, Swannee County, Florida, species of special concern, USA, Blind but with non-functional eye-spots that control...

Barry Mansell / Silver Glen Spring Cave Crayfish (Procambarus attiguus) from an underground aquifer in Ocala National Forest, Florida, USA

Barry Mansell / Silver Glen Spring Cave Crayfish (Procambarus attiguus) from an underground aquifer in Ocala National Forest, Florida, USA

Barry Mansell / Silver Glen Spring Cave Crayfish (Procambarus attiguus) from an underground aquifer in Ocala National Forest, Florida, USA

Barry Mansell / Woodville karst cave crayfish (Procambarus orcinus) a blind crayfish, Leon County, West Florida, USA

Sue Daly / Spiny lobster / Crawfish {Palinurus elephas} Channel Islands, UK

Thomas Marent / Lamington Spiny Crayfish (Euastacus sulcatus) in defensive posture, Lamington National Park, Australia

Barry Mansell / Cave crayfish (Procambarus leitheuseri), USA

Barry Mansell / Blind Cave Crayfish (Procambarus l alachua) found in an underground aquifer in north Florida. Note its non functional eye spot. Alachua Co, Florida, USA

Barry Mansell / Cave crayfish (Procambarus l alachua) Bat cave, Florida, USA

Barry Mansell / Cave crayfish (Procambarus l alachua) Bat cave, Florida, USA

Barry Mansell / Crayfish (Procambarus shermani) male. Escambia River floodplain, West Florida. Endemic to USA

Barry Mansell / Crayfish (Procambarus shermani) Escambia River floodplain, West Florida. Endemic to USA

John Cancalosi / Louisiana crayfish / crawfish (Procambarus clarkii) defensive posture, Louisiana, USA

John Cancalosi / Louisiana crayfish / crawfish (Procambarus clarkii) portrait, Louisiana, USA

John Cancalosi / Louisiana crayfish / crawfish (Procambarus clarkii) mouthparts, Louisiana, USA

Barry Mansell / Southern Crayfish Frog (Rana areolata areolata) South East Okalhoma, USA

Barry Mansell / Northern Crayfish Frog (Rana areolata circulosa) South Central Mississippi, USA

Barry Mansell / Crawfish frog {Rana areolata} Louisiana, USA.

Winfried Wisniewski / Common Kingfisher (Alcedo atthis) male with Crayfish prey, Europe

Francis Abbott / Painted crawfish close-up. (Panulirus versicolor) Bahrain. Abuthama reef.

Francis Abbott / Painted crawfish. (Panulirus versicolor) Bahrain. Abuthama reef.

Francis Abbott / Painted crawfish in reef. (Panulirus versicolor) Bahrain. Abuthama reef.

Francis Abbott / Painted crawfish in reef. Abuthama reef, Bahrain

Pete Oxford / Gopher Frog (Rana capito) at burrow, Orianne Indigo Snake Preserve, Georgia

Pete Oxford / Gopher Frog (Rana capito) at burrow, Orianne Indigo Snake Preserve, Georgia

Pete Oxford / Gopher Frog (Rana capito), Orianne Indigo Snake Preserve, Georgia

Suzi Eszterhas / Raccoon (Procyon lotor) orphaned baby fishing for shellfish in backyard of foster home, WildCare Wildlife Rehabilitation Center, San Rafael, California

Hiroya Minakuchi / Great Egret (Ardea alba) catching a crawfish

Claudio Contreras / Caribbean spiny lobster (Panulirus argus) sitting disoriented on top of Common sea fan (Gorgonia ventalina) after being driven out of hiding by fisherman. Caribbean spiny lobster fishery, Utila Island...

Alex Mustard / Spotted spiny lobster (Panulirus guttatus) crawling over a coral reef at night. East End, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Alex Mustard / Atlantic goliath grouper (Epinephelus itajara) feeding on a Caribbean spiny lobster (Panulirus argus). Despite the awkward shape of its meal, the grouper made short work of it. Jardines de la Reina, G...

Shane Gross / Caribbean spiny lobster (Panulirus argus) in a trap or fish pot in The Bahamas.

Erwan Quéméré / Sails of restored old crawfish boat "Solveig" entering Douarnenez harbour, Brittany, France.