Jan Hamrsky / Great diving beetle (Dytiscus marginalis) and Dragonfly nymph (Aeshnidae), Europe, August, controlled conditions

Ross Hoddinott / Southern hawker (Aeshna cyanea) dragonfly in flight, Broxwater, Cornwall, UK. August.

Ross Hoddinott / Southern hawker (Aeshna cyanea) dragonfly in flight, Broxwater, Cornwall, UK. August.

Ross Hoddinott / Southern hawker (Aeshna cyanea) dragonfly in flight, Broxwater, Cornwall, UK. July.

Jan Hamrsky,Jan Hamrsky / Darner dragonfly nymph (Aeshnidae) portrait, Europe, July, controlled conditions

Colin Varndell / Close up of head and thorax of male migrant hawker dragonfly (Aesgna mixta) Hartland Moor, Dorset, UK September

Nick Upton / 2020VISION / Male Southern hawker dragonfly (Aeshna cyanea) sunning itself on Rose flower (Rosa sp.) in garden in autumn, Wiltshire, England, UK, October . Property released. Did you know? The Latin name for this...

Stephen Dalton / Brown hawker dragonfly (Aeshna grandis) with morning dew, clinging to lichen-covered twig, UK

Stephen Dalton / Tropical hawker dragonfly (Aeshnidae) in flight, Everglades, Florida, USA.

Russell Cooper / Male Southern hawker dragonfly (Aeshna cyanea) in flight, Wimbledon Common, South London, UK

Bernard Castelein / Southern hawker dragonfly {Aeshna cyanea} Brasschaat, Belgium

Ross Hoddinott / Female emperor dragonfly (Anax imperator) laying eggs at the edge of a pond. Cornwall, UK.

Ross Hoddinott / Female emperor dragonfly (Anax imperator) laying eggs at the edge of a pond. Cornwall, UK.

Kim Taylor / Southern Hawker Dragonfly (Aeshna cyanea) male. Close-up of eyes. UK. Captive.

Kim Taylor / Southern hawker dragonfly {Aeshna cyanea} male hovering over pond, UK.

Ross Hoddinott / Southern hawker dragonfly {Aeshna cyanea} Broxwater, Cornwall, UK

Mark Yates / Southern hawker dragonfly {Aeshna cyanea} on yellow iris. England, UK

Hans Christoph Kappel / Southern hawker dragonfly head close-up, Germany

Tim Fitzharris / Southern Hawker Dragonfly (Aeshna cyanea) close-up, on stem, New Mexico

Tim Fitzharris / Southern Hawker Dragonfly (Aeshna cyanea) close up, moisture on wings, New Mexico

Laurie Campbell / Southern hawker dragonfly (Aeshna cyanea) resting by garden pond in autumn, Berwickshire, Scotland, UK. October.

Ross Hoddinott / Southern hawker dragonfly (Aeshna cyanea) in flight. Cornwall, UK. July.

Ross Hoddinott / Female Emperor dragonfly (Anax imperator) laying eggs in pond. Meeth Quarry nature reserve, Devon, UK. July.

Ross Hoddinott / Male Emperor dragonfly (Anax imperator) resting on reeds by water's edge. Meeth Quarry nature reserve, Devon, UK. July.

Andy Rouse / European beaver (Castor fiber) swimming in late light, watching an approaching dragonfly, Cornwall, UK. August. Captive.

Andy Rouse / European beaver (Castor fiber) swimming in late light, watching an approaching dragonfly, Cornwall, UK. August. Captive.

Andy Rouse / European beaver (Castor fiber) swimming in late light, watching an approaching dragonfly, Cornwall, UK. August. Captive.

Jussi Murtosaari / Female Green hawker dragonfly (Aeshna viridis) laying eggs, Finland. August.

Jussi Murtosaari / Male Siberian hawker dragonfly (Aeshna crenata), biggest dragonfly in Europe, resting on tree trunk, Finland. July.

Jussi Murtosaari / Male hairy dragonfly (Brachytron pratense) resting on leaf, Finland. June.

Robert Thompson / Common hawker (Aeshna Juncea) head detail, Brackagh Moss National Nature Reserve, County Armagh, Northern Ireland. July.

Robin Chittenden / Blue emperor dragonfly (Anax imperator) ovipositing, egg laying, Norfolk, UK. July.

Ernie Janes / Norfolk hawker (Anaciaeschna isoceles) dragonfly resting on a fern frond, Norfolk, UK. June.

Ernie Janes / Norfolk hawker (Anaciaeschna isoceles) dragonfly resting on a fern frond, Norfolk, UK. June.

David Tipling / Norfolk hawker dragonfly (Aeshna isoceles) in flight, Strumpshaw Fen, Norfolk, England, UK. June.

David Tipling / Norfolk hawker / Green-eyed dragonfly (Aeshna isoceles) resting on a leaf, HIckling, Norfolk, UK. June.

Ross Hoddinott / Emperor dragonfly (Anax imperator) female ovipositing in pond. Cornwall, England, UK. August.

Nick Upton / Migrant hawker dragonfly (Aeshna mixta) male sunning on a Gorse bush on a chalk grassland slope, Polden Hills, Somerset, UK, September.

Nick Upton / Migrant hawker dragonfly (Aeshna mixta) male sunning on a Gorse bush on a chalk grassland slope, Polden Hills, Somerset, UK, September.

Nick Upton / Emperor dragonfly (Anax imperator) female ovipositing whilst standing on pond vegetation. Wiltshire, England, UK. May.

Robin Chittenden / Migrant hawker (Aeshna mixta) Norfolk, England, UK. September.

Nick Upton / Little egret (Egretta garzetta) hunting a Migrant hawker dragonfly (Aeshna mixta) on marshy pastureland, Catcott Lows National Nature Reserve, Somerset, UK, September.

Nick Upton / Little egret (Egretta garzetta) hunting a Migrant hawker (Aeshna mixta) dragonfly on marshy pastureland, Catcott Lows National Nature Reserve, Somerset, UK, September.

Robin Chittenden / Hairy hawker dragonfly (Brachytron pratense) freshly emerged from exuvia. Norwich, Norfolk, England, UK. May.

Michael Hutchinson / Emperor dragonfly (Anax imperator) newly emerged adult hangs from flowering rush (Butomus umbellatus) with two exuvia above garden pond, Bristol, UK, May.

Michael Hutchinson / Emperor dragonfly (Anax imperator) teneral - or recently moulted adult amongst foliage, Bristol, UK, May

Michael Hutchinson / Emperor dragonfly (Anax imperator) teneral - or recently moulted adult amongst foliage, Bristol, UK, May

Michael Hutchinson / Emperor dragonfly (Anax imperator) hanging from exuvia during incomplete metamorphosis, Bristol, UK, May