Bert Willaert / Male Humayun's Wrinkled Frog (Nyctibatrachus humayuni) calling next to egg clutches on leaves. Western Ghats, India.

Stephen Dalton / Mass of frogspawn of Common frog {Rana temporaria} UK

Andy Sands / Common frogs (Rana temporaria) Pair in amplexus among frogspawn, Captive, UK, March

Andy Sands / Common frogs (Rana temporaria) Pair in amplexus among frogspawn, Captive, UK, March

S. Zankl / Male Great / Northern Crested Newt, (Triturus cristatus) in frogspawn, Germany

Willem Kolvoort / Common frogs (Rana temporaria) mating amongst a mass of frogspawn, Holland

Warwick Sloss / Tadpoles of Common frog hatching from frogspawn {Rana temporaria} sequence 5/6

Jane Burton / Common Frog (Rana temporaria) tadpoles developing in spawn

Ross Hoddinott / 2020VISION / Frog spawn {Rana temporaria} just a 1-2 days old, backlit on lightbox, Cornwall, UK. January 2012.

Ross Hoddinott / 2020VISION / Frog spawn (Rana temporaria) close-up of backlit spawn, Cornwall, UK. January,

Mark Hamblin / 2020VISION / Girl's hand holding spawn of Common frog (Rana temporaria) in garden pond in spring, Warwickshire, UK (Model released)

Roland Seitre / Yellow-striped / Magdalena Poison Dart Frog (Dendrobates truncatus) tadpole in petri dish. Cali Zoo, Cali, Colombia 2010. Growth development Sequence 3 of 3. With front and back legs

Roland Seitre / Yellow-striped / Magdalena Poison Dart Frog (Dendrobates truncatus) tadpole in petri dish. Cali Zoo, Cali, Colombia 2010. Growth development Sequence 2 of 3. With back legs

Roland Seitre / Yellow-striped / Magdalena Poison Dart Frog (Dendrobates truncatus) tadpole in petri dish. Cali Zoo, Cali, Colombia 2010. Growth Development Sequence 1 of 3.

Roland Seitre / Lehmann's Poison Dart Frog (Oophaga lehmanni) spawn. This species feeds tadpoles exclusively on unfertilised eggs. Critically endangered, Cali Zoo, Cali, Colombia, 2010.

Shibai Xiao / Dwarf snakehead (Channa gachua) feeding on frog eggs in a pond, Bawangling National Nature Reserve, Hainan Island, China.

Linda Pitkin / 2020VISION / Clumped frogspawn of Common Frog (Rana temporaria) , and chained spawn of Common Toad (Bufo bufo) in pond water. Surrey, England, March.

Bert Willaert / Male Humayun's Wrinkled Frog (Nyctibatrachus humayuni) from leaf above stream, by egg clutches. Western Ghats, India.

John Cancalosi / Northern Cat-eyed Snake (Leptodeira septentrionalis) swallowing frog eggs. Costa Rican tropical rainforest.

Daniel Heuclin / Gladiator Tree Frog (Hyla boans) spawn in nest in the sand near creek. French Guyana, August.

Thomas Marent / Common Frog (Rana temporaria) pair in amplexus with egg spawn, Switzerland

Thomas Marent / Common Frog (Rana temporaria) pair in amplexus with egg spawn, Switzerland

Thomas Marent / Common Frog (Rana temporaria) pair in amplexus with egg spawn, Switzerland

Thomas Marent / Common Frog (Rana temporaria) egg spawn, Switzerland

Pete Oxford / Giant Gladiator Treefrog (Hypsiboas boans) egg spawn in mud nest, Rewa River, Iwokrama Rainforest Reserve, Guyana

Pete Oxford / Giant Gladiator Treefrog (Hypsiboas boans) egg spawn in mud nest, Rewa River, Iwokrama Rainforest Reserve, Guyana

Stephen Dalton / Frogspawn of the Common frog (Rana temporaria) in pond, UK

Stephen Dalton / Common frog (Rana temporaria) tadpoles hatching from frogspawn, UK

Stephen Dalton / Common frog (Rana temporaria) in water with frogspawn, controlled conditions, UK

Stephen Dalton / Frogspawn of Common frog (Rana temporaria) at water surface, UK

Stephen Dalton / Common frog {Rana temporaria} underwater with frogspawn, UK, controlled conditions

Stephen Dalton / Common frog (Rana temporaria) tadpoles recently hatched from spawn, UK

Stephen Dalton / Ball of Frogspawn of Common frog {Rana temporaria} UK

Konrad Wothe / Common Frog (Rana temporaria) in spawn, Bavaria, Germany

Konrad Wothe / Common Frog (Rana temporaria) spawn in pond, Bavaria, Germany

Adrian Davies / Sign warning against taking frog / toad spawn from water, or adding any spawn to the water, Richmond Park, London, England

Alex Hyde / Frog embryo {Rana temporaria} within spawn, undergoing cleavage.

Laurie Campbell / Common Frog (Rana temporaria) spawn close-up, Berwickshire, Scotland, UK, March

Bernard Castelein / Common Frog (Rana temporaria) in water amongst frogspawn, Brasschaat, Belgium

Steve Knell / Common frog (Rana temporaria) pair in amplexus amongst spawn, Derbyshire, UK, March

John Cancalosi / Common frogs (Rana temporaria) mating pair in amplexus, surrounded by frogspawn, UK

Andy Sands / Common frogs (Rana temporaria) Pair in amplexus among frogspawn, Hertfordshire, UK, March

S. Zankl / Male Great / Northern Crested Newt (Triturus cristatus) with frogspawn, Germany

S. Zankl / Alpine newt (Triturus alpestris) eating frogspawn, Germany

S. Zankl / Alpine newt (Triturus alpestris) eating frogspawn, Germany

S. Zankl / Alpine newt (Triturus alpestris) eating frogspawn, Germany

S. Zankl / Male Great / Northern Crested Newt, (Triturus cristatus) in frogspawn, Germany

Willem Kolvoort / Common frogs (Rana temporaria) mating amongst frogspawn, Holland

Willem Kolvoort / European edible frog eggs (Rana esculenta) on Shining pondweed, Holland

Willem Kolvoort / Common frog eggs (Rana temporaria) underwater, Holland

Willem Kolvoort / Common frog eggs (Rana temporaria) on bottom of pond, Zwolle, Holland

Willem Kolvoort / European edible frog eggs (Rana esculenta) just below pond surface, wrapped around aquatic plants, Holland

Willem Kolvoort / Split level view of Common frogspawn (Rana temporaria) covered in red sediment from iron hydroxide in the brook, Holland

Willem Kolvoort / Common frogs (Rana temporaria) mating amongst frogspawn, Holland

Willem Kolvoort / Common frogs (Rana temporaria) mating amongst frogspawn, Holland

Willem Kolvoort / Great pond snails (Lymnaea stagnalis) with European edible frog spawn (Rana esculenta) Holland

Willem Kolvoort / Common frogs mating (Rana temporaria) sand winning pit, Holland

Willem Kolvoort / Common frogs (Rana temporaria) mating at bottom of pond, frogspawn behind, Holland

Neil Bromhall / Spawn of Red eyed tree frog {Agalychnis callidryas} developing on leaf with tadpoles clearly visible inside, Panama

Warwick Sloss / Frogspawn of Common frog {Rana temporaria} sequence 1/6

Warwick Sloss / Embryos of Common frog developing within frogspawn {Rana temporaria} sequence 4/6

Warwick Sloss / Embryos of Common frog developing within frogspawn {Rana temporaria} sequence 3/6

Warwick Sloss / Embryo of Common frog within frogspawn {Rana temporaria} sequence 2/6

Fabio Liverani / Eggs of Agile frog {Rana dalmatina} Italy

Simon Colmer / Common frog spawn (Rana temporaria) UK

Simon Colmer / Common frog spawn (Rana temporaria) UK

Simon Colmer / Common frog (Rana temporaria) lifecycle sequence showing development from frogspawn via tadpole to adult frog, Digital Composite

Andy Sands / Common Frogs {Rana temporaria} in amplexus mating among spawn, Hertfordshire, UK.

Andy Sands / Common Frogs {Rana temporaria} in amplexus, mating amongst spawn, Hertfordshire, UK.

Andy Sands / Common frogs {Rana temporaria} in amplexus mating among spawn, Hertfordshire, UK

John Cancalosi / Wood frog {Rana sylvatica} pair in amplexus, surrounded by spawn, New York, USA.

Mark Payne-Gill / Common frog spawn {Rana temporaria} UK

Andy Sands / Common Frogs {Rana temporaria} in amplexus among spawn, Hertfordshire, England

Gary Smith / Common frogs {Rana temporaria} mating in garden pond surrounded by frogspawn, UK.

Gary Smith / Common frogs {Rana temporaria} mating in garden pond, UK.

Jane Burton / Common Frogs (Rana temporaria) in amplexus prior to spawning beside spawn laid by another pair.

Jane Burton / Spawn of Common Frog (Rana temporaria)

Jane Burton / Common Frog (Rana temporaria) Embryos developing in the spawn. Bubbles form on the outside of the jelly as the water warms.

Jane Burton / Common Frog (Rana temporaria) Embryos developing within spawn

Jane Burton / Common Frog (Rana temporaria) gilled tadpoles beginning to swim away from spawn

Jane Burton / Common Frogs (Rana temporaria) in amplexus prior to spawning beside spawn laid by another pair.

Jane Burton / Common Frog (Rana temporaria) Newly hatched tadpoles hanging from old spawn

Jane Burton / Common Frogs (Rana temporaria) in amplexus prior to spawning beside spawn laid by another pair.

Jane Burton / Common Frog (Rana temporaria) tadpoles developing in mass of spawn

Jane Burton / Spawn of Common Frog (Rana temporaria) with tadpoles starting to develop each within its sphere of jelly

Jane Burton / Common Frog (Rana temporaria) Embryos developing within spawn

Jane Burton / Common Frog (Rana temporaria) embryos developing within spawn

Jane Burton / Common Frog (Rana temporaria) with spawn

Jane Burton / Common Frog (Rana temporaria) newly hatched tadpoles hanging from old spawn

Jane Burton / Common Frog (Rana temporaria) Newly hatched tadpoles hanging from old spawn while growing gills

Kim Taylor / Eggs of Common frog {Rana temporaria} frogspawn, UK.

Kim Taylor / Common frog tadpoles {Rana temporaria} UK.

Dan Burton / Common frog spawn in pond {Rana temporaria} Scotland, UK

Adam White / Boy looking at jar of frogspawn, pond dipping, UK

Adam White / Boy with jar of frogspawn, pond dipping, UK.

Jane Burton / Air bubble trapped amongst Common Frogspawn (Rana temporaria) UK