Bernard Castelein / Raft spider (Dolomedes fimbriatus) on Tansy (Tanacetum vulgare), Klein Schietveld, Brasschaat, Belgium August

Alex Hyde / Raft Spider (Dolomedes fimbriatus) female on heathland pool. Note wing of predated damselfly floating on water's surface under the spider. Dorset, UK. August.

Kim Taylor / Raft spider (Dolomedes fimbriatus) male resting on water surface, Surrey, UK

Ross Hoddinott / 2020VISION / Raft spider (Dolomedes fimbriatus) on water, Arne RSPB reserve, Dorset, England, UK, July. 2020VISION Book Plate. Did you know? Raft spiders trap air bubbles close to their body when they submerge, al...

Stephen Dalton / Raft spider (Dolomedes fimbriatus) feeding on Stickleback fish prey, UK, Pisauridae

Stephen Dalton / Raft spider (Dolomedes fimbriatus) feeding on Stickleback fish prey, UK, Pisauridae

Wild Wonders of Europe / Benvie / Female Raft spider (Dolomedes fimbriatus) with egg sac, Fliess, Naturpark Kaunergrat, Tirol, Austria, July 2008

Wild Wonders of Europe / Benvie / Female Raft spider (Dolomedes fimbriatus) carrying egg sac, Fliess, Naturpark Kaunergrat, Tirol, Austria, July 2008

Dietmar Nill / Raft spider (Dolmedes fimbriatus) on water. Germany, Europe

Bernard Castelein / Raft spider (Dolomedes fimbriatus) with web on Rush (Juncus sp). Klein Schietveld, Brasschaat, Belgium. September.

Bernard Castelein / Raft spider (Dolomedes fimbriatus) with web on Rush (Juncus sp). Klein Schietveld, Brasschaat, Belgium. September.

Mike Read / Raft spider (Dolomedes fimbriatus) young amongst grass and rush stems, Arne RSPB Reserve, Dorset, England, UK, August.

Nick Upton / Juvenile Raft spider (Dolomedes fimbriatus) in vegetation, Studland Heath, Dorset, England, UK, July.

Nick Upton / Raft spider (Dolomedes fimbriatus) juvenile among vegetation around a boggy pool, Studland Heath, Dorset, UK, July.

Nick Upton / Raft spider (Dolomedes fimbriatus) juvenile hunting on vegetation around a boggy pool, Studland Heath, Dorset, UK, July.

Konrad Wothe / Raft Spider (Dolomedes fimbriatus) withfemale Small Red-eyed Damselfly (Erythromma viridulum) prey on water surface, Upper Bavaria, Germany, May.

Nick Upton / Raft spider (Dolomedes fimbriatus) juvenile with fly prey on a Cross-leaved heath (Erica tetralix) flowerhead in a bog, Studland Heath, Dorset, UK, July.

Jussi Murtosaari / Great raft spider (Dolomedes plantarius) left, and fen raft spider (Dolomedes fimbriatus), Finland, May.

Will Watson / Raft spider (Dolomedes fimbriatus) on Sphagnum, County Kerry, Republic of Ireland. June.

Will Watson / Raft spider (Dolomedes fimbriatus) on Sphagnum, Whixall Moss, Fenn's, Whixall and Bettisfield Mosses National Nature Reserve, Shropshire, England, UK. June.

Bernard Castelein / Raft spider (Dolomedes fimbriatus), Klein Schietveld, Brasschaat, Belgium. August

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

Nick Garbutt / Raft spider (Dolomedes fimbriatus) resting on water's surface. Nordtirol, Tirol, Austian Alps, Austria. July.

Bernard Castelein / Raft spider (Dolomedes fimbriatus) on Tansy (Tanacetum vulgare), Klein Schietveld, Brasschaat, Belgium August

Andy Sands / Raft spider (Dolomedes fimbriatus) out of water resting on old heather stem, Surrey, England, UK, July

Alex Hyde / Raft Spider (Dolomedes fimbriatus) male resting on the surface of a moorland pool. Nordtirol, Austrian Alps, June.

Alex Hyde / Raft Spider (Dolomedes fimbriatus) male resting on the surface of a moorland pool. Nordtirol, Austrian Alps, June.

Alex Hyde / Raft Spider (Dolomedes fimbriatus) male resting on the surface of a moorland pool. Nordtirol, Austrian Alps, June.

Alex Hyde / Raft Spider (Dolomedes fimbriatus) female resting on the surface of a moorland pool among stems of Horsetail (Equisetum sp.). Nordtirol, Austrian Alps, June.

Alex Hyde / Raft Spider (Dolomedes fimbriatus) female resting on the surface of a moorland pool. Nordtirol, Austrian Alps, June.

Alex Hyde / Raft Spider (Dolomedes fimbriatus) female resting on the surface of a moorland pool, photographed with a fisheye lens to show surrounding habitat. Nordtirol, Austrian Alps, June.

Alex Hyde / Raft Spider (Dolomedes fimbriatus) female resting on the surface of a moorland pool, photographed with a fisheye lens to show surrounding habitat. Nordtirol, Austrian Alps, June.

Alex Hyde / Raft Spider (Dolomedes fimbriatus) female resting on the surface of a moorland pool, photographed with a fisheye lens to show surrounding habitat. Nordtirol, Austrian Alps, June.

Alex Hyde / Raft Spider (Dolomedes fimbriatus) juvenile female resting on the surface of a moorland pool. Nordtirol, Austrian Alps, June.

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

MYN / Niall Benvie / Raft spider (Dolomedes fimbriatus) Burgundy. France, April.

Alex Hyde / Raft Spider (Dolomedes fimbriatus) female on heathland pool. Note wing of predated damselfly floating on water's surface under the spider. Dorset, UK. August.

Alex Hyde / Raft Spider (Dolomedes fimbriatus) female on heathland pool. Note wing of predated damselfly floating on water's surface under the spider. Dorset, UK. August.

Alex Hyde / Raft spider (Dolomedes fimbriatus) female on Heathland pool, Surrey, UK. October.

Alex Hyde / Raft spider (Dolomedes fimbriatus) female on Heathland pool, Surrey, UK. October. The multicoloured film results from chemoautotrophic bacteria that oxidise iron and manganese ions in the water, with...

Chris Mattison / Raft spider (Dolomedes fimbriatus) eating tadpole. Roudsea Woods, Cumbria, England, UK, May.

Kim Taylor / Raft spider (Dolomedes fimbriatus) female feeding on drowned dragonfly. Surrey, England, September.

Kim Taylor / Raft spider (Dolomedes fimbriatus) female feeding on drowned dragonfly. Surrey, England, September.

Kim Taylor / Raft spider (Dolomedes fimbriatus) female on leaf (Potamogeton sp) Surrey, England, September.

Bernard Castelein / Raft spider (Dolomedes fimbriatus) juvenile, Klein Schietveld, Brasschaat, Belgium, August.

Bernard Castelein / Raft spider (Dolomedes fimbriatus) on rush seed head, Klein Schietveld, Brasschaat, Belgium

Bernard Castelein / Raft spider (Dolomedes fimbriatus) on rush seed head, Klein Schietveld, Brasschaat, Belgium

Jussi Murtosaari / Raft spider (Dolomedes fimbriatus) running on water, South Karelia, southern Finland, May.