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

Stephen Dalton / 'Optical bench' made in early 1970's for detecting flying insects. This device was capable of detecting the tiniest of insects such as fruit flies and fleas. It was used for almost all Ste...

David Hall / Sea fleas (Chromopleustes oculatus) on dorsal surface of a Giant sunflower seastar, Port Neville, Johnstone Strait, British Columbia, Canada. March.

Nick Upton / Great crested newt (Triturus cristatus) male courting a female by arching his back and waving his tail in a garden pond at night, surrounded by Water fleas (Daphnia pulex), near Wells, Somerset, UK, M...

Nick Upton / Great crested newt (Triturus cristatus) male in a garden pond at night, surrounded by Water fleas (Daphnia pulex), Mendip Hills, near Wells, Somerset, UK, March. Photographed under license.

Nick Upton / Two male Palmate newts (Lissotriton helveticus) swimming in a garden pond at night surrounded by Water fleas (Daphnia pulex), near Wells, Somerset, UK, March.

Nick Upton / Palmate newt (Lissotriton helveticus) male in a garden pond at night with webbed hind feet spread wide, surrounded by Water fleas (Daphnia pulex), near Wells, Somerset, UK, March.

Nick Upton / Two male Palmate newts (Lissotriton helveticus) swimming in a garden pond at night surrounded by Water fleas (Daphnia pulex), near Wells, Somerset, UK, March.

Nick Upton / Palmate newt (Lissotriton helveticus) male in a pond maintained for newts and other pond life surrounded by Water fleas (Daphnia pulex), a major prey item, Mendip Hills, near Wells, Somerset, UK, Febr...

Nick Upton / Great crested newt (Triturus cristatus) male in a pond maintained for newts and other pond life surrounded by Water fleas (Daphnia pulex), a major prey item, Mendip Hills, near Wells, Somerset, UK, Fe...

Nick Upton / Pair of Great crested newts (Triturus crustatus) and a Palmate newt (Lissotriton helveticus) swimming in a pond, surrounded by Water fleas (Daphnia pulex), Somerset, England, UK, February. Filmed at...

Nick Upton / Male Great crested newt (Triturus crustatus) displaying to a female in a pond, with another female swimming past feeding on Water fleas (Daphnia pulex), Somerset, England, UK, February. Filmed at nig...

Alex Hyde / Water fleas (Daphnia sp.) and a green algae (Volvox aureus) in water from a garden pond. Derbyshire, UK. September. Digital composite.

David Pattyn / Green monkey (Chlorocebus sabaeus) picking fleas with each other, Bijilo Forest Park, Kololi, Serrekunda, Gambia, Africa, May.

Ammonite / Group of Water fleas (Daphnia) swimming. Controlled conditions.

Ammonite / Group of Water fleas (Daphnia) swimming. Controlled conditions.

Ammonite / Group of Water fleas (Daphnia) swimming. Controlled conditions.

Jan Hamrsky / Water fea (Daphnia) with eggs, Europe, September, controlled conditions

Mark MacEwen / Freshwater Flea (Daphnia magna) giving birth, controlled conditions, 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 fleas (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 flea (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, model released

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

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) and Yellow water lily, Peat bog lake, Holland

Willem Kolvoort / Water fleas (Daphnia magna) Holland

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

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

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

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

Kim Taylor / RF- Water flea (Daphnia sp.) with winter eggs. UK. (This image may be licensed either as rights managed or royalty free.)

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

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