Fergus Gill / 2020VISION / Roe Deer (Capreolus capreolus) doe running in a field of barley, Northumberland, England, summer. Although Roe deer mate in August, the fertilised egg is dormant until January, which prevents the fema...

Tony Wu / Seven-lined prickleback (Ernogrammus zhirmunskii) eggs, 5mm in diameter. Develpoing embryos inside fertilised eggs. Hokkaido, Japan. May.

Tony Wu / Spotnape cardinalfish (Ostorhinchus notatus) pair, male taking cluster of fertilised eggs into mouth to brood. Shizuoka Prefecture, Honshu, Japan. June.

Tony Wu / Spotnape cardinalfish (Ostorhinchus notatus) pair, male taking cluster of fertilised eggs into mouth to brood. Shizuoka Prefecture, Honshu, Japan. June.

Tony Wu / Spotnape cardinalfish (Ostorhinchus notatus) pair spawning. Male has taken fertilised eggs into mouth to brood, female chasing male in an apparent attempt to steal eggs. Shizuoka Prefecture, Honshu, J...

Tony Wu / Spotnape cardinalfish (Ostorhinchus notatus) pair spawning. Male taking fertilised eggs into mouth to brood. Shizuoka Prefecture, Honshu, Japan. June.

Heather Angel / Chinese sturgeon (Acipenser sinensis), captive in aquarium. Adults are no longer able to swim upriver to spawn due to Gezhouba and Three Gorges dams. Eggs fertilised at Institute of Chinese Sturgeon a...

SCOTLAND: The Big Picture / Pouring freshly fertilised Atlantic Salmon (Salmo salar) eggs into a rotating vat, Sandbank hatchery, Glenlivet, Moray, Scotland, UK, November.

SCOTLAND: The Big Picture / Biologist washing freshly fertilised Atlantic salmon (Salmo salar) eggs, an important part of the process preventing them from getting smothered, Sandbank Hatchery, Glenlivet, Moray, Scotland, Novembe...

Juergen Freund / Divers 'encouraging' Giant clams (Tridacna sp) to spawn by injecting serotonin into the clams. Sperm and eggs are collected and fertilised and larvae are cultured for clam farming. Sempoma, Sabah, Bor...

Alex Mustard / The smaller male ornate Ghost Pipefish (Solenostomus paradoxus) turns belly to belly with the larger female ghost pipefish and fertilises the eggs in her brood pouch. Unlike many seahorses, pipefish a...

Nature Production / Apple {Malus domestica} early growth of apple fruit from fertilised flower, Japan, Apple fruition sequence 3/4

Nature Production / Apple {Malus domestica} fertilised flower stalk, Japan, Apple fruition sequence 2/4

Willem Kolvoort / Stonewort algae {Chara vulgaris} with male fertilised cells, Lake Naarden, Holland

Kim Taylor / Brine shrimp {Artemia salina} female with fertilised eggs in pouch.

David Hall / Weedy seadragon {Phyllopteryx taeniolatus} male carrying fertilised eggs, south Australia Also known as Common seadragon

David Hall / Weedy seadragon {Phyllopteryx taeniolatus} male carrying fertilised eggs, south Australia Also known as Common seadragon

David Hall / Weedy seadragon {Phyllopteryx taeniolatus} male carrying fertilised eggs, south Australia Also known as Common seadragon

Paul D Stewart / A swan orchid 'Cycnoches' in gilt on the front cover of the first edition (plum, ribbed) of 'On the Various Contrivances by which Orchids are fertilised by Insects and the good effects of intercrossin...

Paul D Stewart / 'Swan Orchid' (Cyncnoches sp.) by Charles Darwin, 1862 first issue (idnentified by gilt orchid and ridged plum cloth) or 'On the various contrivances by which British and foreign orchids are fertilise...

Jordi Chias / Arrow crabs (Stenorhynchus lanceolatus) pair, female underneath male after mating, male is guarding the fertilised eggs from other male Arrow crabs, protected from predators by Sea urchin quills, Gran...