Ross Hoddinott / Blue-tailed damselfly (Ischnura elegans), male on Common horsetail (Equisetum arvense), Cornwall, UK. June.

Graham Eaton / Llyn Cwmorthin, with Common horsetail (Equisetum arvense) Tanygrisiau, Wales, February 2014

Graham Eaton / Common Horsetail (Equisetum arvense) growing on the Llyn Peninsular coast, near Nefyn, North Wales

Bernard Castelein / Field horsetail (Equisetum arvense) fertile shoots, Brasschaat, Belgium, April.

Kevin Schafer / Field Horsetail (Equisetum arvense) plants emerging from shallow water, Moses Coulee, Washington

Piotr Naskrecki / Field Horsetail (Equisetum arvense) releasing sporophytes, Estabrook Woods, Massachusetts

Paul Hobson / Common field Horsetails (Equisetum arvense) in spring showing cones, Yorkshire, UK, May

Paul Hobson / Common field Horsetails (Equisetum arvense) in spring showing cones, Yorkshire, UK, May

Paul Hobson / Common field Horsetails (Equisetum arvense) in spring showing cones, Yorkshire, UK, May

Nature Production / Common Field Horsetail {Equisetum arvense} with roots, flowering stalk and fronds visible, Gumma, Japan

Nature Production / Common Field Horsetail dry spores (microscopic photography) {Equisetum arvense} Japan

Nature Production / Common Field Horsetails {Equisetum arvense} Japan

Jim Brandenburg / Thickspike Gayfeather (Liatris pycnostachya) flowering on tallgrass prairie, Crow-Hassan Park Reserve, Minnesota

Jim Brandenburg / Blue Jay (Cyanocitta cristata) pair fighting while a third watches, Minnesota

Jim Brandenburg / Black-footed Ferret (Mustela nigripes) smelling ground, Wyoming

Sandra Bartocha / Red-flowered Cowslip (Primula veris), Potsdam, Brandenburg, Germany

Sandra Bartocha / Oxeye/Marguerite daisies (Leucanthemum vulgare), Potsdam, Brandenburg, Germany.

Jim Brandenburg / Sundogs, also known as mock sun, with snow field, Minnesota

Jim Brandenburg / Thickspike Gayfeather (Liatris pycnostachya) flowers with eagle-shaped cloud, Touch the Sky Northern Tallgrass Prairie National Wildlife Refuge, Minnesota

Nick Upton / Great Crane Project team members Beate Blahy and Roland Digby inspecting Eurasian / Common crane eggs (Grus grus) in reed pool nest in Germany before collecting them for UK reintroduction programme. S...

Wild Wonders of Europe / Möllers / Three Common cranes (Grus grus) in flight, Brandenburg, Germany, October 2008

Wild Wonders of Europe / Möllers / Common cranes (grus grus) in flight silhouetted at dusk, Brandenburg, Germany, October 2008

Wild Wonders of Europe / Möllers / Common crane (Grus grus) flock, standing in water and in flight, Brandenburg, Germany, October 2008

Wild Wonders of Europe / Möllers / Common cranes (Grus grus) at sunrise, Brandenburg, Germany, October 2008