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

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.

Colin Monteath / Domestic Sheep (Ovis aries) and twin lambs, Flea Bay, Banks Peninsula, Canterbury, New Zealand

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 / 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}

Albert Lleal / Cat Flea (Ctenocephalides felis) SEM close-up at 28x magnification

Kim Taylor / Lesser Bladderwort (Utricularia minor) bladder with Water flea {Daphnia sp} trapped by its antenna. Surrey, UK

Jane Burton / Black Syrian Hamster {Mesocricetus auratus} about to be sprayed with prescription flea spray

Jane Burton / Spraying a Mongolian Gerbil {Meriones unguiculatus} with non-aerosol flea spray

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,

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 / Common hydra {Hydra vulgaris} capturing a water flea {Daphnia sp.}. 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

Mark Moffett / Flea Beetle (Diamphidia nigroornata) feeding on Myrrh Tree (Commiphora sp) larvae produce a toxin not found in adults which is used by Kalahari Bushmen as a poison, Namibia

Mark Moffett / Scorpion Fly eats Flea Beetle, Fortuna National Park, Panama

Mark Moffett / Flea Beetle (Diamphidia nigroornata) larvae used to poison arrow by Kalahari or Kung Desert Bushman, Namibia

Mark Moffett / Flea Beetle (Diamphidia nigroornata) larvae used to poison arrows are thought after by Kalahari or Kung Desert Bushman who is digging for them, Namibia

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...

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

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