Nick Upton / Red mason bees (Osmia bicornis) entering and leaving nest hole drilled into a log within an insect hotel, Gloucestershire, England, UK, April.

Nick Upton / Leafcutter / Rose-cutter bee (Megachile willughbiella) lands at its nest in a Bamboo tube in an insect hotel near several nests she has completed and some Potter wasp (Ancistrocerus sp.) nests, Wiltsh...

Phil Savoie / Red mason bee (Osmia bicornis) female bee bringing in pollen load under her abdomen for brood cell, Monmouthshire, Wales, UK, May.

Phil Savoie / Red mason bee (Osmia bicornis) male at bee hotel. Monmouthshire, Wales, UK. May.

Phil Savoie / Red mason bee (Osmia bicornis) female bee bringing in pollen load under her abdomen for brood cell in bee hotel. Monmouthshire, Wales, UK. May.

Nick Upton / Leafcutter / Rose-cutter bee (Megachile willughbiella) emerging from its nest in a Bamboo tube in an insect hotel after provisioning it with pollen, Wiltshire, UK, July.

Nick Upton / Recently completed Leafcutter / Rose-cutter bee (Megachile willughbiella) and Potter wasp (Ancistrocerus sp.) nests in Bamboo tubes in an insect hotel, Wiltshire, UK, July.

Nick Upton / Leafcutter / Rose-cutter bee (Megachile willughbiella) emerging from its nest in a Bamboo tube in an insect hotel, Wiltshire, UK, July.

Nick Upton / Leafcutter / Rose-cutter bee (Megachile willughbiella) emerging from its nest in a Bamboo tube in an insect hotel after provisioning it with pollen, Wiltshire, UK, July.

Nick Upton / Leafcutter / Rose-cutter bee (Megachile willughbiella) carrying a circular section of a Rose leaf it has just cut to its nest in a Bamboo tube in an insect hotel, Wiltshire, UK, July.

Nick Upton / Leafcutter / Rose-cutter bee (Megachile willughbiella) lands at its nest in a Bamboo tube in an insect hotel to provision it with pollen carried on the long hairs under its abdomen, Wiltshire, UK, Jul...

Andy Sands / Resin Bee (Heriades truncorum) sealing the end of a nesting tube in a garden Bee hotel with resin, Hertfordshire, England, UK, June