Nigel Cattlin / Pollen beetles (Brassicogethes aeneus) on Field scabious (Knautia arvensis). Berkshire, England, UK. July.

Nigel Cattlin / Buff-tailed bumblebee (Bombus terrestris) nectaring on Spear thistle (Cirsium vulgare), thistle with Pollen beetle (Brassicogethes aeneus) infestation. Berkshire, England, UK. July.

Nigel Cattlin / Pollen beetle (Brassicogethes aeneus) infestation on Nipplewort (Lapsana communis). Berkshire, England, UK. July.

Nigel Cattlin / Field rose (Rosa arvensis) with Pollen beetles (Brassicogethes aeneus) on petals and anthers. Berkshire, England, UK. June.

Heather Angel / Common pollen beetle (Brassicogethes aeneus), group feeding on pollen in Dog rose (Rosa canina) flower. Pollen picked up all over body and transferred to other flowers. Hampshire, England, UK. July.

Doug Wechsler / Milkweed stem weevil (Rhyssomatus lineaticollis) feeding on common milkweed sap Morris Arboretum, Philadelphia, Pennsylavania, USA. August.

Jeff Foott / Mountain pine beetle (Dendroctonus ponderosae) entrance hole into Lodgepole Pine tree with sap / pitch tube, USA, August. The current outbreak of mountain pine beetles has been particularly aggressive...

Jeff Foott / Dead Mountain pine beetle (Dendroctonus ponderosae) 'pitched out' by pitch / resin in Lodgepole pine tree, Grand Teton National Park, Wyoming, USA. August. The current outbreak of mountain pine beetl...

Jeff Foott / Dead Mountain pine beetle (Dendroctonus ponderosae) 'pitched out' by pitch / resin in Lodgepole pine tree, Grand Teton National Park, Wyoming, USA. August. The current outbreak of mountain pine beetl...

Jeff Foott / Dead Mountain pine beetle (Dendroctonus ponderosae) 'pitched out' by pitch / resin in Lodgepole pine tree, Grand Teton National Park, Wyoming, USA. August. The current outbreak of mountain pine beetl...

Jeff Foott / Lodgepole pine tree pitch tube, part of tree defence against Mountain pine beetles (Dendroctonus ponderosae) Grand Teton National Park, Wyoming. USA. The current outbreak of mountain pine beetles has...

Jeff Foott / Mountain pine beetle (Dendroctonus ponderosae) 'pitched out' by pitch / resin in Lodgepole pine tree, Grand Teton National Park, Wyoming, USA, August. The current outbreak of mountain pine beetles...