Nick Upton / Aerial view of a dense flock of Great Cormorants (Phalacrocorax carbo) resting on a sandbank at Scroby Sands along with a mixed species flock of gulls including Greater black-backed gulls (Larus marin...

Nick Upton / 2020VISION / Flock of juvenile Common / Eurasian cranes (Grus grus) recently released by the Great Crane Project onto the Somerset Levels and Moors, fly over grazing cattle. Somerset, UK, October 2010.

Anup Shah / Aerial view of Lesser Flamingos {Phoeniconaias minor} about to take off. Lake Natron, Kenya.

Anup Shah / Aerial view of Lesser Flamingos {Phoeniconaias minor} Lake Natron, Tanzania.

Anup Shah / Aerial view of Lesser Flamingos {Phoeniconaias minor} Lake Natron, Tanzania.

Anup Shah / Aerial view of Lesser Flamingos {Phoeniconaias minor} Lake Natron, Tanzania.

Alex Mustard / Aggregation of Spider crabs (Maja brachydactyla) in shallow water in summer. These aggregations seem to be for protection (safety in numbers) while the crabs are moulting, and therefore vulnerable. Ba...

Alex Mustard / Portrait of a Spider crabs (Maja brachydactyla) during an aggregation in shallow water in summer. These aggregations seem to be for protection (safety in numbers) while the crabs are moulting, and the...

Andy Sands / Mining bee (Andrena argentata) small mining bee confined to sandy heaths in southern England sometimes nests in very large aggregations, Surrey, England, UK, July

Nick Garbutt / Local school children watching the mass aggregations of Straw-coloured fruit bats (Eidolon helvum) leaving their roost at dusk. Kasanka National Park, Zambia. November 2013.

Nick Garbutt / Local school children proudly wearing Kasanka Trust t-shirts on a visit to the National Park to see the mass aggregations of straw-coloured fruit bats (Eidolon helvum). Kasanka National Park, Zambia....

Nick Garbutt / Local school children proudly wearing Kasanka Trust t-shirts on a visit to the National Park to see the mass aggregations of straw-coloured fruit bats (Eidolon helvum). Kasanka National Park, Zambia....

Nick Garbutt / Local school children proudly wearing Kasanka Trust t-shirts on a visit to the National Park to see the mass aggregations of straw-coloured fruit bats (Eidolon helvum). Kasanka National Park, Zambia....

Nick Garbutt / Local school children proudly wearing Kasanka Trust t-shirts on a visit to the National Park to see the mass aggregations of straw-coloured fruit bats (Eidolon helvum). Kasanka National Park, Zambia....

Nick Garbutt / Waterberry fruit (Syzygium cordatum), a major food source for the massive aggregations of straw-coloured fruit bats. Kasanka National park, Zambia.

Nick Upton / 2020VISION / Adult and juvenile Common / Eurasian cranes (Grus grus) released by the Great Crane Project foraging on flooded pastureland around a grain feeder used to supplement their diet in winter, with two danc...

Nick Upton / 2020VISION / Forty-five adult and juvenile Common / Eurasian cranes (Grus grus) released by the Great Crane Project foraging on flooded pastureland around a grain feeder used to supplement their diet in winter, Al...

Nick Upton / Lapwings (Vanellus vanellus) coming in to land on flooded meadows on the Somerset Levels after several days of heavy rain, UK, December.

Nick Upton / Black headed gulls Chroicocephalus ridibundus) in winter plumage in flight over others feeding on flooded meadow on the Somerset Levels after several days of heavy rain, UK, December.

Nick Upton / Black headed gulls Chroicocephalus ridibundus) in winter plumage in flight over others feeding on flooded meadow on the Somerset Levels after several days of heavy rain, UK, December.

Nick Upton / Common limpets (Patella vulgata) encrusted with Common barnacles (Balanus balanoides) attached to sandstone boulder low on shoreline, exposed at low tide, St. Bees, Cumbria, UK, July.

Nick Upton / Dense aggregation or 'bloom' of Kelp flies / Bristly-legged seaweed flies (Coelopa frigida) sheltering on sandstone cliff face behind beach, Crail, Scotland, UK, July.

Nick Upton / Dense aggregation or 'bloom' of Kelp flies / Bristly-legged seaweed flies (Coelopa sp.) sheltering on sandstone cliff face behind beach, Crail, Scotland, UK, July.

Nick Upton / Honeycomb worm reef (Sabellaria alveolata) with clustered tubes built of sand grains attached to boulders, exposed at low tide with the sea in the background, St.Bees, Cumbria, UK, July.

Nick Upton / Common barnacles (Balanus balanoides) attached to a rock filter feeding hard, Crail, Fife, UK, July

Nick Upton / Common barnacles (Balanus balanoides) attached to a rock filter feeding hard, Crail, Fife, UK, July

Nick Upton / Dense gathering of Common periwinkles (Littorina liitorea) of all ages in a rockpool lined with Coralweed (Corallina officinalis) and Irish moss (Chondrus crispus), North Berwick, East Lothian, July

Nick Upton / Dense aggregation of Common periwinkles (Littorina littorea) in a rockpool, North Berwick, East Lothian, UK, July

Nick Upton / Dense gathering of adult and young Common periwinkles (Littorina liitorea) on red sandstone rocks exposed at low tide, North Berwick, East Lothian, July.

Nick Upton / Dense gathering of adult and young Common periwinkles (Littorina liitorea) on red sandstone rocks exposed at low tide, North Berwick, East Lothian, July.

Nick Upton / Dense aggregation of adult and young Common periwinkles (Littorina littorea) in a rockpool, North Berwick, East Lothian, UK, July.

Nick Upton / Dense aggregation of Common periwinkles (Littorina littorea) in a rockpool alongside a variety of red algae, Crail, Fife, UK, July

Nick Upton / Dense cluster of Dog whelks (Nucella lapillus), predators of barnacles, on rocks encrusted with Common barnacles (Semibalanus balanoides) exposed at low tide, St. Bees, Cumbria, UK, July

Nick Upton / Dense cluster of Dog whelks (Nucella lapillus), predators of barnacles, on rocks encrusted with Common barnacles (Semibalanus balanoides) exposed at low tide, St. Bees, Cumbria, UK, July

Nick Upton / Four Dog whelks (Nucella lapillus), predators of barnacles, on rocks encrusted with Common barnacles (Semibalanus balanoides) exposed at low tide, some with barnacles growing on their shells, North Be...

Nick Upton / Dog whelks (Nucella lapillus) on rocks encrusted with Common barnacles (Semibalanus balanoides) exposed at low tide, some with barnacles growing on their shells, North Berwick, East Lothian, UK, July

Nick Upton / Dog whelks (Nucella lapillus) dense cluster on rocks encrusted with Common barnacles (Semibalanus balanoides) exposed at low tide, some with barnacles growing on their shells, with sand flats and the...

Nick Upton / Common periwinkles (Littorina liitorea) alongside yellow and brown Rough periwinkles (Littorina saxatilis) nestled in a crevice in sandstone rocks at low tide, Crail, Fife, July

Nick Upton / 2020VISION / Wigeon (Anas penelope) flocks in flight over and resting on partially frozen flooded marshland in winter, Catcott Lows National Nature Reserve, Somerset Levels, UK, January.

Nick Upton / 2020VISION / Wigeon (Anas penelope) flock and a few Pintail (Anas acuta) resting on partially frozen flooded marshland in winter sunshine, Catcott Lows National Nature Reserve, Somerset Levels, UK, January.

Nick Upton / 2020VISION / Wigeon (Anas penelope) flock and a few Pintail (Anas acuta) resting on partially frozen flooded marshland in winter sunshine, Catcott Lows National Nature Reserve, Somerset Levels, UK, January.

Nick Upton / 2020VISION / Wigeon (Anas penelope), flock coming in to land on partially frozen flooded marshland in winter, Catcott reserve, Somerset Levels, UK, January.

Nick Upton / 2020VISION / Dense flock of Wigeon (Anas penelope) and Teal (Anas crecca) landing on flooded marshes near stands of Bullrushes (Typha latifolia) in winter, Greylake RSPB reserve, Somerset Levels, UK, January.

Nick Upton / 2020VISION / Wigeon (Anas penelope) flock coming in to land on partially frozen flooded marshland in winter, Catcott Lows National Nature Reserve, Somerset Levels, UK, January.

Nick Upton / Aerial view of Domestic sheep (Ovis aries), resting in grassy pastureland criss-crossed by their trails Norfolk, UK, January.

Nick Upton / Aerial view of Domestic sheep (Ovis aries) grazing on Horsford Castle Hill, the remains of an 11th century Mott and Bailey fortress, now grassed over to become pastureland, Near Norwich, Norfolk, UK,...

Nick Upton / Aerial view of Herring gulls (Larus argentatus) following tractor harvesting sugar beet, Norfolk, UK, January.

Nick Upton / Aerial view of Herring gulls (Larus argentatus) following tractor harvesting sugar beet, Norfolk, UK, January.