Solvin Zankl / Honey bee (Apis mellifera) workers caring for queen cells, Kiel, Germany

Solvin Zankl / Honey bee (Apis mellifera) workers looking after queen cells, Kiel, Germany

Solvin Zankl / Honey bee (Apis mellifera) feeding larvae in brood cells, Kiel, Germany

Solvin Zankl / Honey bee (Apis mellifera) workers in hive with three white queen cells, Kiel, Germany, June.

Ammonite / Tracking shot into the entrance of a Buff-tailed bumble bee (Bombus terrestris) nest, showing larvae in wax cells, France, May.

Ammonite / Buff-tailed bumble bees (Bombus terrestris) inside nest, with wax cells containing honey, France, May.

SINCLAIR STAMMERS / Light photomicrograph of Blue green algae / Cyanobacteria (Nostoc sp) capable of nitrogen fixation, and used for soil enrichment especially with rice cultivation. The long filaments are composed of in...

Stephen Dalton / Honey bees (Apis mellifera) filling honey storage cells in hive, UK

Stephen Dalton / Honey bee (Apis mellifera) filling honey storage cells in the hive, UK

John B Free / Honey bee queen cells and pupae (Apis mellifera) - cells opened to show pupae

Martin Gabriel / European Honeybee Queen laying eggs surrounded by workers {Apis mellifera}

Kim Taylor / Filamentous green algae {Spirogyra sp} showing cell structure