John Chan / Honey bees (Apis mellifera) gathering at the entrance of their nest in a hollow log, with some returning workers carrying pollen baskets, Bolsa Chica Ecological Reserve, California, USA, October.

Michael Durham / Honey Bee (Apis mellifera) with pollen baskets, Oregon

Ammonite / Buff-tailed bumble bee (Bombus terrestris) removing pollen baskets from back legs into a wax honey pot in nest, France, May.

Michael Durham / Honey Bee (Apis mellifera) with pollen baskets taking flight from garden flower

Michael Durham / Honey Bee (Apis mellifera) worker collecting nectar from Red Clover (Trifolium pratense) flowers, note the pollen baskets on the legs, northwest Oregon

Konrad Wothe / Honey Bee (Apis mellifera) collecting pollen from willow flower, note full pollen baskets, Germany

Konrad Wothe / Honey Bee (Apis mellifera) collecting pollen from daisy, note pollen baskets on hind legs, Germany

Phil Savoie / Buff tailed bumblebee (Bombus terrestris) queen flying to Oriental poppy flower (Papaver orientale) with pollen baskets, Monmouthshire, Wales, UK. July.

Phil Savoie / Yellow legged mining bee (Andrena flavipes) female with full pollen baskets, on bank of the River Monnow, Monmouthshire, Wales, UK. April

Phil Savoie / Yellow legged mining bee (Andrena flavipes) female with pollen baskets full, outside nest burrow, Monmouthshire, Wales, UK. September

Phil Savoie / Orange legged furrow bee (Halictus rubicundus) feeding on Poached egg flower (Limnanthes douglasii), showing pollen baskets on hind legs, Monmouthshire, Wales, UK. March.

Heather Angel / Honey bee (Apis mellifera) with full pollen baskets feeding on Balkan anemone (Anemone blanda). In garden. Surrey, England, UK. April.