Steve Downer / Timelapse of Primrose (Primula vulgaris) flowers opening, UK. March. Controlled conditions.

Michael Hutchinson / Common primrose (Primula vulgaris) flowers Bristol, UK

Ross Hoddinott / Common primroses {Primula vulgaris} in flower, near Bradworthy, Devon, UK.

Heather Angel / Large bee fly (Bombylius major) feeding on Primrose (Primula vulgaris). England, UK. March.

Heather Angel / Common bee fly (Bombylius major) feeding on Primrose (Primula vulgaris). March.

Heather Angel / Common bee fly (Bombylius major) nectaring on Primrose (Primula vulgaris). This insect is the main pollinator of Primrose. In nature reserve, Surrey, England, UK, April.

Philippe Clement / Common primrose / English primrose (Primula vulgaris) in flower on moss covered rock in spring, Scotland, UK, May

David Tipling / Primroses (Primula vulgaris) and Violet (Viola odorata) growing along banks of mountain stream Caithness, Scotland, UK, May.

David Tipling / Primroses (Primula vulgaris) growing along banks of mountain stream Caithness, Scotland, UK, May.

Dave Bevan / Slow motion clip of a Dark edged bee fly (Bombylius major) nectaring from a Primrose flower (Primula vulgaris), Carmarthenshire, Wales, UK, May.

Nick Upton / Common primroses (Primula vulgaris) flowering in a garden, Wiltshire, UK, April.

Laurie Campbell / Primrose (Primula vulgaris) flowers in decidious woodland, Berwickshire, Scotland, April.

Mark Bowler / Inca tern {Larosterna inca}in flight, Paracas National Park, Peru

JIM CLARE / Pair of Inca terns, (Larosterna inca). Punta San Juan Reserve, (Reserva Nacional de Islas, Islotes y Puntas Guaneras) Peru.

Konrad Wothe / Inca tern (Larosterna inca) South America, captive

Konrad Wothe / Inca terns (Larosterna inca) South America, captive.

Cyril Ruoso / Inca tern (Larosterna inca) perching on cliff face in Nazca coastal desert in Paracas National Reserve, Peru

Cyril Ruoso / Inca terns (Larosterna inca) courtship behaviour, Punta San Juan, Peru

Cyril Ruoso / Inca tern (Larosterna inca) male and female in courtship display, guano island, Pescadores, Peru

Cyril Ruoso / Inca tern (Larosterna inca) male and female pairs in courtship display, guano island, Pescadores, Peru

Cyril Ruoso / Inca tern (Larosterna inca) male and female pairs in courtship display, guano island, Pescadores, Peru

Cyril Ruoso / Inca tern (Larosterna inca) small flock on rocks, guano island Pescadores, Peru

Cyril Ruoso / Inca tern (Larosterna inca) taking off from guano island Pescadores, Peru

Cyril Ruoso / Inca tern (Larosterna inca) arriving at nest site with fish in beak, guano island, Pescadores, Peru