Nick Upton / Northern shoveler pair (Anas clypeata) swim among submerged reeds and rushes in flooded marshland on a sunny winter afternoon. Greylake RSPB reserve, Somerset Levels, UK, January

Rolf Nussbaumer / Two-Tailed swallowtail butterfly (Papilio multicaudata), adult perched on Texas Bluebonnet (Lupinus texensis), Texas, USA. April

Rolf Nussbaumer / Two-Tailed Swallowtail {Papilio multicaudata} on Texas Buckeye (Aesculus glabra) Hill Country, Texas, USA