Kim Taylor / Tree bumblebee (Bombus hypnorum) worker approaching nest in bird box. Surrey, England, UK, May.

Phil Savoie / Tree bumblebee (Bombus hypnorum) melanistic form, Wales UK, June.

Phil Savoie / Tree bumblebee (Bombus hypnorum) feeding from Chive (Allium schoenoprasum), Monmouthshire, Wales, UK. June.

Phil Savoie / Tree bumblebee (Bombus hypnorum) dark form, feeding on Chive (Allium schoenoprasum) Monmouthshire, Wales UK, June.

Phil Savoie / Tree bumblebee (Bombus hypnorum) dark form, worker bee, feeding on hardy geranium flower, Monmouthshire, Wales, UK, May.

Phil Savoie / Tree bumblebee (Bombus hypnorum) dark form, worker bee, flying to hardy geranium flower, Monmouthshire, Wales, UK, May.

Phil Savoie / Tree bumblebee (Bombus hypnorum) feeding on Flax (Linum usitatissimum), Monmouthshire, Wales, UK. May.

Phil Savoie / Tree bumblebee (Bombus hypnorum) feeding on Geranium flower (Geranium sp.) Monmouthshire, Wales, UK, April.

Phil Savoie / Tree bumblebee (Bombus hypnorum) feeding on Geranium flower (Geranium sp.) Monmouthshire, Wales, UK, April.

Nick Upton / Tree bumblebee (Bombus hypnorum) foraging on Creeping thistle (Cirsium arvense) flower in a meadow, Wiltshire, UK, July.

Rod Williams / Tree bumble bee (Bombus hypnorum) feeding on Ragwort (Jacobaea vulgaris) Brockley Cemetery, Lewisham, London, UK July

Rod Williams / Tree bumble bee (Bombus hypnorum) feeding on Ragwort (Jacobaea vulgaris) Brockley Cemetery, Lewisham, London, UK July