Heather Angel / Honey bee (Apis mellifera) forages on pollen in Apple (Malus domestica) flower, collecting pollen in pollen basket. In garden, Surrey, England, UK. May.

Brian Bevan / Pantaloon bee (Dasypoda hurtles) entering burrow with pollen, Bedfordshire, England, UK, August.

Dave Bevan / Female Pantaloon bee (Dasypoda hirpites) returning to burrow, Bedfordshire, England, UK, July.

Heather Angel / Honey bee (Apis mellifera) foraging on Peony (Paeonia officinalis) pollen. Surrey, England, UK. May.

Heather Angel / Wool carder bee (Anthidium manicatum) male attempting to mate with pollen laden female on Rusty foxglove (Digitalis ferruginea). In garden, Surrey, England, UK. August.

Heather Angel / Honey bee (Apis mellifera) with full pollen basket foraging on pollen in Caucasian peony (Paeonia daurica Pollen transferred on bee's body to other flowers. In garden, Surrey, England, UK. May.

Heather Angel / Honeybee (Apis mellifera) with full pollen baskets and pollen on head, thorax and abdomen. Bee withdrawing from Snowdrop (Galanthus nivalis) flower after nectaring. In garden, Surrey, England, UK. Feb...

Cyril Ruoso / Asian clams (Corbicula fluminea) on river bed, exotic and invasive species, River Lot, France, August.

MD Kern / Palo Alto JR Museum / European honey bee (Apis mellifera) carrying pollen on legs, whilst others are building honey comb, captive.

John B Free / Honey Bee (Apis mellifera) tending to a cell at the nest. The bee will provision the cell with pollen and nectar ('bee bread') from its pollen basket or 'corbicula'.

Philippe Clement / Fossil shell (Corbicula fluminalis) on beach, the Netherlands

Kirkendall-Spring / Man digging for clams (Corbicula sp) in Wescott Bay of San Juan Island. Washington, USA, May 2009, model released