Rod Williams / Red mason bee (Osmia bicolor) male feeding on Green alkanet (Pentaglottis sempervirens) Beverley Court Gardens, Lewisham, London, England, UK. April.

Fabrice Cahez / Two colour mason bee (Osmia bicolor) Vosges, France, March.

Andy Sands / Two coloured mason bee (Osmia bicolor) collecting leaf mastic to seal nest in old snail shell, Bedfordshire, England, UK, June

Andy Sands / Two coloured mason bee (Osmia bicolor) collecting leaf mastic to seal nest in old snail shell, Bedfordshire, England, UK, June

Rod Williams / Red mason bees (Osmia bicolor) Mating pair Beverley Court Gardens, Lewisham, London, England, UK April.

Andy Sands / Two coloured mason bee (Osmia bicolor) Bee manouvering old snail shell to nest in, Bedfordshire, England, UK, June

Andy Sands / Two coloured mason bee (Osmia bicolor) carrying dead grass to cover nest in old snail shell, Bedfordshire, England, UK, June

Andy Sands / Two coloured mason bee (Osmia bicolor) Bee covering nest in old snail shell with dead grass, Bedfordshire, England, UK, June

Andy Sands / Two coloured mason bee (Osmia bicolor) carrying dead grass to cover nest in old snail shell, Bedfordshire, England, UK, June

Rod Williams / Red mason bee (Osmia bicolor) Brockley, Lewisham, London. May.

Andy Sands / Two coloured mason bee (Osmia bicolor) bee that nests in old snail shells and then carries bits of twig or vegetation to cover the shell, Buckinghamshire, England, UK, June

Andy Sands / Two coloured mason bee (Osmia bicolor) bee that nests in old snail shells and then carries bits of twig or vegetation to cover the shell, Buckinghamshire, England, UK, June

Ammonite / Mason bee (Osmia bicolor) flying and feeding from Violet (Viola) flowers, France, March.

Solvin Zankl / Two-coloured mason bee (Osmia bicolor) flying back to its nest, carrying dried stalks, Germany. May. Second place in the Other animals category of European Nature Photographer of the Year 2023. Wildli...

Solvin Zankl / Two-coloured mason bee (Osmia bicolor) flying back to its nest, carrying dried stalks, Germany. May.

Solvin Zankl / Two-coloured mason bee (Osmia bicolor) flying back to its nest, carrying dried stalks, Germany. May.

Solvin Zankl / Two-coloured mason bee (Osmia bicolor) flying back to its nest, carrying dried stalks, Germany. May.

Solvin Zankl / Two-coloured mason bee (Osmia bicolor) collecting pollen from wildflower, Germany. June.

Solvin Zankl / Two-coloured mason bee (Osmia bicolor) flying back to its nest, carrying dried stalks, Germany. June.

Solvin Zankl / Two-coloured mason bee (Osmia bicolor) walking through dried stalks, Germany. June.

Solvin Zankl / Two-coloured mason bee (Osmia bicolor) carrying dried stalk back to its nest, Germany. June.

Solvin Zankl / Two-coloured mason bee (Osmia bicolor) flying back to its nest, carrying dried stalks, Germany. June.

Solvin Zankl / Two-coloured mason-bee (Osmia bicolor) on pile of dried stalks, Germany. June.

Solvin Zankl / Male Two-coloured mason bee (Osmia bicolor) building its nest in empty snail shell, Germany. June.

Solvin Zankl / Two-coloured mason bee (Osmia bicolor) female covering nest with twigs and grass for camouflage, Witzenhausen, Germany, May.

Solvin Zankl / Two-coloured mason bee (Osmia bicolor) female covering nest inside snail shell with twigs and grass for camouflage, Witzenhausen, Germany, May.

Solvin Zankl / Two-coloured mason-bee (Osmia bicolor) female repositioning empty snail shell where she has her nest, Witzenhausen, Germany, May.

Solvin Zankl / Two-coloured mason bee (Osmia bicolor) female provisioning nest inside a snail shell with pollen and nectar, Witzenhausen, Germany, May.

Nick Upton / Two-coloured mason bee (Osmia bicolor) turning over a Brown-lipped snail (Cepaeae nemoralis) shell on a chalk grassland slope, Somerset, UK, May. The bee provisions the snail shell with chewed balls o...

Nick Upton / Two-coloured mason bee (Osmia bicolor) resting at its nest in a Brown-lipped snail (Cepaeae nemoralis) shell before flying away, chalk grassland slope, Somerset, UK, May.

Nick Upton / Two-coloured mason bee (Osmia bicolor) female flying in to her nest in a Brown-lipped snail (Cepaeae nemoralis) shell to complete sealing up the brood cells inside with chewed up leaves, on a chalk gr...

Nick Upton / Female Two-coloured mason bee (Osmia bicolor) flying with a long stick to camouflage her nest on a chalk grassland slope, pushing it into position before flying away, Somerset, UK, May.

Nick Upton / Female Two-coloured mason bee (Osmia bicolor) flying with a long stick to camouflage her nest on a chalk grassland slope, pushing it into position before flying away, Somerset, UK, May.

Nick Upton / Female Two-coloured mason bee (Osmia bicolor) flying with a long stick to camouflage her nest on a chalk grassland slope, pushing it into position before flying away, Somerset, UK, May.

Nick Upton / Female Two-coloured mason bee (Osmia bicolor) flying with a long stick to camouflage her nest on a chalk grassland slope, pushing it into position before flying away, Somerset, UK, May.

Nick Upton / Two-coloured mason bee (Osmia bicolor) female landing on a Brown-lipped snail (Cepaeae nemoralis) shell she has built a nest in on a chalk grassland slope and adjusting its position before flying off...

Nick Upton / Two-coloured mason bee (Osmia bicolor) taking off from her nest in a Brown-lipped snail (Cepaeae nemoralis) shell on a chalk grassland slope, Bath and northeast Somerset, UK, May. The bee provisions t...

Nick Upton / Pile of small sticks and dried leaves arranged by a Two-coloured mason bee (Osmia bicolor) to camouflage her nest in a Brown-lipped snail (Cepaeae nemoralis) shell on a chalk grassland slope, Bath and...

Nick Upton / Pile of small sticks and dried leaves arranged by a Two-coloured mason bee (Osmia bicolor) to camouflage her nest in a Brown-lipped snail (Cepaeae nemoralis) shell on a chalk grassland slope, Bath and...

Nick Upton / Two-coloured mason bee (Osmia bicolor) nectaring from a Birdsfoot trefoil flower (Lotus corniculatus) on a chalk grassland slope, Wiltshire, UK, May.

Nick Upton / Two-coloured mason bee (Osmia bicolor) landing at her nest in a Brown-lipped snail (Cepaeae nemoralis) shell with a small stone to help seal it with on a chalk grassland slope, Bath and northeast Some...

Nick Upton / Two-coloured mason bee (Osmia bicolor) flying in with a stick to add to a growing pile of vegetation camouflaging her nest in a Brown-lipped snail (Cepaeae nemoralis) shell on a chalk grassland slope,...

Nick Upton / Two-coloured mason bee (Osmia bicolor) flying in with a long, dried plant stem to add to a growing pile of vegetation camouflaging her nest in a Brown-lipped snail (Cepaeae nemoralis) shell on a chalk...

Nick Upton / Two-coloured mason bee (Osmia bicolor) flying in with a dried grass leaf to add to a growing pile of vegetation camouflaging her nest in a Brown-lipped snail (Cepaeae nemoralis) shell on a chalk grass...

Nick Upton / Two-coloured mason bee (Osmia bicolor) flying to her nest in a Brown-lipped snail (Cepaeae nemoralis) shell with a chewed up leaf to seal a brood cell with after provisioning it with balls of pollen a...

Nick Upton / Two-coloured mason bee (Osmia bicolor) flying to her nest in a Brown-lipped snail (Cepaeae nemoralis) shell with some dried vegetation to begin camouflaging it with on a chalk grassland slope, Bath an...

Nick Upton / Two-coloured mason bee (Osmia bicolor) entering her nest in a Brown-lipped snail (Cepaeae nemoralis) shell with a chewed up leaf to seal a brood cell with after provisioning it with balls of pollen an...

Nick Upton / Two-coloured mason bee (Osmia bicolor) entering her nest in a Brown-lipped snail (Cepaeae nemoralis) shell on a chalk grassland slope, Bath and northeast Somerset, UK, May. The bee provisions the snai...

Mark Taylor / Red-tailed Mason Bee (Osmia bicolor) female infested with Hairy-Footed Mites (Chaetodactylus krombeini).

Mark Taylor / Red-tailed Mason Bee (Osmia bicolor) female infested with Hairy-Footed Mites (Chaetodactylus krombeini).

Mark Taylor / Red-tailed Mason Bee (Osmia bicolor) female infested with Hairy-Footed Mites (Chaetodactylus krombeini).

Mark Taylor / Red-tailed Mason Bee (Osmia bicolor) infested with female Hairy-Footed Mites (Chaetodactylus krombeini).

Nick Upton / Two-coloured mason bee (Osmia bicolor) emerging from her nest site in a Brown-lipped snail (Cepaeae nemoralis) shell on chalk grassland, near Bath, Somerset, UK, April. The bee provisions the snail sh...