Stephen Dalton / Two Water Fleas (Daphnia sp.), showing transparency of bodies and internal organs. UK, September.

Stephen Dalton / Cat flea {Ctenocephalides felis} jumping from cat fur, UK

Stephen Dalton / Cat flea {Ctenocephalides felis} leaping sequence, multiflash image

Wild Wonders of Europe / Roggo / Alpine newt (Triturus alpestris) chasing a ball of Water fleas in a gravel pit pool, Fribourg, Switzerland, June 2009

Kim Taylor / Water flea (Daphnia) trapped in a drop of water on a grass head. UK

Kim Taylor / Dog flea {Ctenocephalides canis} UK.

Kim Taylor / Cat flea {Ctenocephalides felis} amongst cat fur, UK

Juan Manuel Borrero / Illustration of Daphnia and egg pouch. Pencil and watercolor painting.

Stephen Dalton / Water Flea (Daphnia sp.), showing transparency of body and internal organs. UK, September.

SINCLAIR STAMMERS / Common Water flea (Daphnia pulex) found in large numbers in a small shallow pond at Dolbryn Caravan site near Newcastle Emlyn, Pembrokeshire, Wales, UK

SINCLAIR STAMMERS / Common Water fleas (Daphnia pulex) found in large numbers in a small shallow pond at Dolbryn Caravan site near Newcastle Emlyn, Pembrokeshire, Wales, UK

Stephen Dalton / Photographer Stephen Dalton photographing leaping fleas in his studio, UK (1980s)

Stephen Dalton / Cat flea {Ctenocephalides felis} jumping, UK, (0.000017 seconds exposure)

Mark Taylor / Applying spot-on flea treatment to a ginger kitten

Mark Taylor / Applying spot-on flea treatment to a ginger kitten, model released

Alex Hyde / Hedgehog flea {Archaeopsylla erinacei} light micrograph, slide specimen.

Jane Burton / Rabbit flea {Spilopsyllus cuniculi} on the fur of a European rabbit {Oryctolagus cuniculus}

Anup Shah / Flea {Pulicidae} amongst fur of Cheetah {Acinonyx jubatus} Masai Mara GR, Kenya

Nature Production / Water Fleas {Daphnia sp} with fertile eggs on their back,

Elio Della Ferrera / Juvenile Dusky Leaf Monkey (Trachypithecus obscurus) grooming his tail searching for fleas, Thailand 1996

Willem Kolvoort / Underwater mass of Water fleas (Daphnia sp) under Yellow water lily leaves (Nuphar lutea) lake in central Holland

Willem Kolvoort / Water fleas (Daphnia magna) on Water violet (Hottonia palus) Holland

Willem Kolvoort / Water fleas (Daphnia magna) Holland

Willem Kolvoort / Water fleas (Daphnia magna) and Yellow water lily, Peat bog lake, Holland

Jane Burton / Domestic Cat {Felis catus} Tabby kitten wearing red flea collar.

Jane Burton / Owner treats 8-week kitten 'Red' with flea spray, offspring of 'Pansy'

Kim Taylor / Water flea {Daphnia magna} portrait. Captive, UK.

Kim Taylor / Water fleas {Daphnia sp}

Kim Taylor / Bird flea {Siphonaptera sp} clings to feather of Housemartin host, UK.

Kim Taylor / Water flea {Eurycercus lamellata} female carrying eggs.

Kim Taylor / Bird flea larva {Siphonaptera sp} from nest of Housemartin, UK

Kim Taylor / Dog flea {Ctenocephalides canis} UK.

Kim Taylor / Dog fleas {Ctenocephalides canis} UK.

Kim Taylor / Female Water flea {Daphnia sp} with fulled formed young inside carapace, UK. Magnification: x20 at 6x7cm

Kim Taylor / Cat fleas {Ctenocephalides felis} UK

Kim Taylor / Cat fleas {Ctenocephalides felis} UK. Cat fleas can jump 33cm high, far outstretching the jumping capabilities of a human. They would win a silver high jump medal in an animal olympics competition!

Kim Taylor / Water fleas {Daphnia magna}. Captive, UK.

Kim Taylor / Water flea {Daphnia sp.} in a water droplet hanging from a head of grass. UK.

Kim Taylor / Cat Flea (Ctenocephalides felis) amongst hairs, UK. Magnification: x20 at 6x7cm

Kim Taylor / Cat Flea (Ctenocephalides felis) female, laying an egg. UK.

Kim Taylor / Cat Flea (Ctenocephalides felis) larva, engorged with blood, UK captive

Kim Taylor / Cat Flea (Ctenocephalides felis) larvae coiled in defensive position.

Jane Burton / Flea {Pulicidae} on arm of Serotine Bat (Eptesicus serotinus)

Jane Burton / Large flea {Pulicidae} on an African rat (Rhabdomys sp) captive.

Jane Burton / Young Domestic ferrets infected with Grey squirrel fleas, captive, UK.

Solvin Zankl / Common water fleas {Daphnia pulex} Germany

Paul D Stewart / Illustration of human Flea (Pulex irritans). 1744 August Johann Roesel von Rosenhof with copperplate art and engraving with handcolouring. From 'Der monatlich-herausgekommenen Insecten-Belustigungen E...

Paul D Stewart / 1744 illustration of a flea by August Johann Roesel von Rosenhof; copperplate art and engraving with handcolouring. From 'Der monatlich-herausgekommenen Insecten-Belustigungen Erste Sammlung' (Insect...

Paul D Stewart / Woodcut illustration of Black Rat (Rattus rattus), from Volume 1 Conrad Gesner's 1551 Historiae Animalium (here in his Icones Animalium 1560). The black rat's fleas are believed to have carried plague...

Kim Taylor / Bird flea (Siphonaptera sp) on the feather of a House Martin (Delichon urbica) Surrey, England

Petra Wegner / Cavalier King Charles Spaniel, puppy, black-and-tan, 8 weeks, at veterinary surgeon, checking for fleas

Premaphotos / Flea beetle (Aphthona coerulea) feeding on Yellow flag iris leaf, UK

Nature Production / Water Flea {Daphnia sp.} Japan

Nature Production / Water flea {Simocephalus vetulus} (left) and Ostracod {Podocopidae} Japan