Tui De Roy / Salvin's Albatross (Thalassarche salvini) returning en masse to crowded nesting colony at sunset, Proclamation Island, Bounty Islands, New Zealand

Marie Read / Mixed Blackbird flock, mostly Red-winged Blackbirds (Agelaius phoeniceus), in flight against backdrop of autumn foliage in November, Bosque Del Apache National Wildlife Refuge, New Mexico, USA. Novemb...

Marie Read / Snow Geese (Chen caerulescens) large flock in pool at Bosque Del Apache National Wildlife Refuge with setting full moon at sunrise in December, New Mexico, USA. December.

Andy Sands / Wood anemone (Anemone nemorosa) flowering en-masse under coppice woodland a good ancient woodland indicator species, Suffolk, England, UK, April

Paul Harcourt Davies / Spring crocus (Crocus vernus) flowering en masse on the Campo Imperatore, Abruzzo, Italy. April.

Chris & Monique Fallows / Cape fur seals (Arctocephalus pusillus) trying to confuse shark predators by moving en masse. Near Seal Island, False Bay, South Africa.

Peter Cairns / Snow Geese (Chen caerulescens) taking off en-masse in evening light, Bosque del Apache, New Mexico, USA, December.

Floris van Breugel / Hibernating Ladybirds (Hippodamia convergens) assembled en masse to overwinter, King's Canyon National Park, California, USA, May 2009

Andy Sands / Water avens (Geum rivale) growing en-masse on roadside verge, Upper Teesdale, Co. Durham, England, UK, June

Pete Oxford / Communal caterpillars travelling en masse for protection to make predators think they are larger. Amazonia, Peru

Michael Quinton / Pink Salmon (Oncorhynchus gorbuscha) spawning en masse, Alaska

Michael Quinton / Pink Salmon (Oncorhynchus gorbuscha) spawning en masse, Alaska