Juan Carlos Munoz / Stone pine (Pinus pinea) close up of tree bark, Toledo, Castilla-La Mancha, Spain.

Juan Carlos Munoz / Spanish fly (Lytta vesicatoria) on Stone pine (Pinus pinea) bark. Toledo, Castilla-La Mancha, Spain. April.

Ernie Janes / Bark of Stone pine (Pinus pinea) Coto Donana, Spain.

Ernie Janes / Stone pine (Pinus pinea) trees, Coto Donana, Spain.

Dietmar Nill / Flock of Common starlings (Sturnus vulgaris) perched in a Stone pine (Ponus pinea) at dusk, Rome, Italy, December.

Cyril Ruoso / Italian stone pine (Pinus pinea) and coastal landscape, Alberes Mountains, Pyrenees, France, October 2011.

Cyril Ruoso / Italian stone pine (Pinus pinea), Alberes Mountains, Pyrenees, France, October 2011.

Martin Gabriel / Italian stone pine (Pinus pinea) and reed beds in lagoon, Po Delta, Italy, November.

Pal Hermansen / Stone pine (Pinus pinea) forest, near Sevilla, Spain, December

Pal Hermansen / Stone pine (Pinus pinea) forest, near Sevilla, Spain, December

Adrian Davies / Maritime pine (Pinus pinea) tree bark with solidified resin following resin tapping, Portugal. June.