Roger Powell / Spotted Redshank (Tringa erythropus) watching from the top of an old post. Karigasniemi, Inari, Finnish Lapland, May.

Roger Powell / Ruff (Philomachus pugnax) close-up of head and ruff. Karigasniemi, Inari, Finnish Lapland. May.

Roger Powell / Ruff (Philomachus pugnax) males displaying at the lek, side view. Luomos, Karigasniemi, Inari, Finnish Lapland

Roger Powell / Ruff (Philomachus pugnax) males at the lek, hovering in flight as part of their display. Luomos, Karigasniemi, Inari, Finnish Lapland

Roger Powell / Ruff (Philomachus pugnax) males at the lek, hovering in flight as part of their display. Luomos, Karigasniemi, Inari, Finnish Lapland

Roger Powell / Ruff (Philomachus pugnax) male at the lek, hovering in flight as part of his display. Luomos, Karigasniemi, Inari, Finnish Lapland

Roger Powell / Ruffs (Philomachus pugnax) males fighting and displaying at the lek. Luomos, Karigasniemi, Inari, Finnish Lapland

Roger Powell / Ruffs (Philomachus pugnax) males fighting and displaying at the lek. Luomos, Karigasniemi, Inari, Finnish Lapland

Roger Powell / Wood Sandpiper (Tringa glareola) feeding on the mossy edge of a stream and eating a shrimp. Luomos, Karigasniemi, Inari, Finnish Lapland.

Roger Powell / Wood Sandpiper (Tringa glareola) feeding on a stream. Luomos, Karigasniemi, Inari, Finnish Lapland.

Roger Powell / Red-necked phalarope (Phalaropus lobatus) resting on an island of vegetation whilst feeding along a stream. Luomos, Karigasniemi, Inari, Finnish Lapland. June.

Roger Powell / Pair of Bar-tailed godwits (Limosa lapponica) male courting female over the breeding marsh. Luomos, Karigasniemi, Finland, Lapland. June.

Roger Powell / Arctic Tern (Sterna paradisaea) male courtship feeding female with a dragonfly nymph. Karigasniemi, Finnish Lapland, Finland, June.

Jussi Murtosaari / Long tailed skua (Stercorarius longicaudus) Utsjoki, Laplandi, Finland, May.

Markus Varesvuo / Yellow Wagtail (Motacilla flava) male, Karigasniemi, Finland,

Markus Varesvuo / Lapland bunting (Calcarius lapponicus) male perched, Karigasniemi, Finland, June 2005

Markus Varesvuo / Lapland bunting (Calcarius lapponicus) male perched, Karigasniemi, Finland, June 2005

Markus Varesvuo / Lapland bunting (Calcarius lapponicus) male flying, Karigasniemi, Finland, June 2005

Markus Varesvuo / Lapland bunting (Calcarius lapponicus) male flying, high angle shot, Karigasniemi, Finland, June 2005

Markus Varesvuo / Bluethroat male {Luscinia svecica / Erithacus svecicus} Karigasniemi, Finland.

Markus Varesvuo / Bluethroat {Luscinia svecica / Erithacus svecicus} male perching with prey in beak, Karigasniemi, Norway.

Jussi Murtosaari / Long-tailed Jaeger (Stercorarius longicaudus) resting on rock in habitat, Karigasniemi, Finland, July.

Jussi Murtosaari / Woodland ringlet butterfly (Erebia medusa ssp. polaris) Karigasniemi, Finland, July.

Jussi Murtosaari / Idas Blue or Northern Blue (Plebejus idas) male feeding, Lapland, Karigasniemi, Finland, July.

Jussi Murtosaari / Northern Clouded Yellow or Hecla Sulphur (Colias hecla) on Thyme (Thymus serpyllum subsp. tanaensis) Karigasniemi, Finland, July.

Jussi Murtosaari / Warble fly (Hypoderma tarandi) a parasitic fly whose larvae, once the eggs are ingested by reindeer, form swellings under the skin, Karigasniemi, Finland, July.

Jussi Murtosaari / Bluethroat (Luscinia svecica) male, Lapland, Karigasniemi, Finland, July.

Jussi Murtosaari / Idas Blue or Northern Blue butterflies (Plebejus idas) copulating, male with unusual black stripe, Lapland, Karigasniemi, Finland, July.

Danny Green / Wood sandpiper (Tringa glareola) at dusk silhouetted against setting sun, Karigasniemi, Northern Finland, May . Bookplate from Danny Green's 'The Long Journey North'

Roger Powell / Heath habitat with scattered Hairy Birch (Betula pubescens) and Scots Pine (Pinus sylvestris) trees at their northern limit, Ivalo Heath, Karigasniemi, Finnish Lapland. July 2009

Roger Powell / Wood sandpiper (Tringa glareola) male, wading at the edge of stream, Karigasniemi, Lapland, Finland. May.

Roger Powell / Wood sandpiper (Tringa glareola) male, wading at the edge of stream, Karigasniemi, Lapland, Finland. May.

Roger Powell / Temminck's stint (Calidris temminckii) resting at the edge of a stream, Karigasniemi, Lapland, Finland. May.

Roger Powell / White wagtail (Motacilla alba) standing on vegetation in stream, Karigasniemi, Finnish Lapland, Finland. May.

Roger Powell / White wagtail (Motacilla alba) feeding in stream, Karigasniemi, Finnish Lapland, Finland. May.

Roger Powell / Dark headed wagtail (Motacilla flava thunbergi) female, landing on vegetation in stream, Karigasniemi, Finnish Lapland, Finland. May.

Roger Powell / Wood sandpiper (Tringa glareola) standing on mossy stump at edge of stream, Karigasniemi, Finnish Lapland. May.

Roger Powell / Wood sandpiper (Tringa glareola) standing on mossy stone at edge of stream, Karigasniemi, Finnish Lapland. May.

Jussi Murtosaari / Red-necked phalarope (Phalaropus lobatus) at waters edge, Finland

Jussi Murtosaari / Red-necked phalarope (Phalaropus lobatus), Finland, June.

Jussi Murtosaari / Bluethroat (Luscinia svecica) male singing, Finland, June.

Jussi Murtosaari / Bar-tailed godwit (Limosa lapponica), male, Finland, June.

Jussi Murtosaari / Bar-tailed godwit (Limosa lapponica), males, Finland, June.