Nick Upton / Male Eurasian beaver (Castor fiber) grazing on Brooklime (Veronica beccabunga) at dusk, River Otter, Devon, England, UK, June.

Konrad Wothe / Wide angle shot of a male Beautiful demoiselle (Calopteryx virgo) on European speedwell (Veronica beccabunga), takes off and flies away, Bavaria, Germany, July.

Konrad Wothe / Male Beautiful demoiselle (Calopteryx virgo) taking off from and landing on Brooklime (Veronica beccabunga), Bavaria, Germany, July.

Konrad Wothe / Close-up of a male Beautiful demoiselle (Calopteryx virgo) landing on European speedwell (Veronica beccabunga), Bavaria, Germany, July.

Konrad Wothe / Slow motion clip of a male Beautiful demoiselle (Calopteryx virgo) landing on Brooklime (Veronica beccabunga), Bavaria, Germany, July.

Simon Colmer / Brooklime (Veronica beccabunga) flower, Sussex, England, UK. June.

Nick Upton / Brooklime (Veronica beccabunga) flowering in a shallow stream, Corfe Common, Dorset, UK, July.

Stephen Dalton / Brooklime (Veronica beccabunga) at water's edge, UK

Linda Pitkin / European speedwell (Veronica beccabunga) in flower. Nutfield Marsh Nature Reserve, Surrey, UK. June.

Linda Pitkin / European speedwell (Veronica beccabunga) in flower. Nutfield Marsh Nature Reserve, Surrey, UK. June.

Linda Pitkin / European speedwell (Veronica beccabunga) in flower. Nutfield Marsh Nature Reserve, Surrey, UK. June.

Will Watson / Brooklime (Veronica beccabunga) in flower, Berrington Hall Estate, Herefordshire, England, UK. Focus stacked.

Linda Pitkin / Brooklime (Veronica beccabunga). Hampton Court, Richmond Upon Thames, England, UK. August.

Nigel Cattlin / Fleshy succulent leaves and blue flower of marginal aquatic plant brooklime (Veronica beccabunga) Berkshire, England, UK, May

Nigel Cattlin / Fleshy succulent leaves and blue flower of marginal aquatic plant brooklime (Veronica beccabunga) Berkshire, England, UK, May