Mute swan pair, Cygnus olor, courting at Martin Mere Wildfowl and Wetlands Trust nature reserve, Burscough, Lancashire, England, United Kingdom, Europe

Robin, Erithacus rubecula, on twig at Martin Mere Wildfowl and Wetlands Trust reserve in Lancashire, England, United Kingdom, Europe

Female mallard (Anas platyrhynchos), stretching wings at Martin Mere Wildfowl and Wetlands Trust reserve, Burscough, Lancashire, England, United Kingdom, Europe

Nene, Branta sandvicensis, Hawaiian goose with goslings, captive at Martin Mere Wildfowl and Wetlands Trust reserve, Burscough, Lancashire, England, United Kingdom, Europe

Whooper swan (Cygnus cygnus) flying down on to the water, Welney Wildfowl and Wetlands Trust Reserve, Norfolk, England, United Kingdom, Europe

Whooper swan, Cygnus cygnus, at Martin Mere Wildfowl and Wetland Centre, Burscough, Lancashire, England, United Kingdom, Europe

Wigeon, Anas penelope, at Martin Mere Wildfowl and Wetlands Trust reserve in Lancashire, England, United Kingdom, Europe

Whooper swans (Cygnus cygnus) on the water, Welney Wildfowl and Wetlands Trust Reserve, Norfolk, England, United Kingdom, Europe

Mute swan, Cygnus olor, Caerlaverock Wildfowl & Wetland Trust reserve, Dumfries & Galloway, Scotland, United Kingdom, Europe

Female mallard duck with newly hatched ducklings, Anas platyrhynchos, on a stream in springtime at Swinbrook, the Cotswolds, UK

Mallard ducks in lakeland countryside at Easedale Tarn lake in the Lake District National Park, Cumbria, UK

Male mallard drake and female duck pair sleeping in meadow, The Cotswolds, Oxfordshire, UK

Grey Heron bird, Ardea cinerea, taking flight from the River Thames in Berkshire, UK

Black swan, Cygnus atratus, with red beak in North Norfolk, UK

Female mallard duck with 14 newly hatched ducklings, Anas platyrhynchos, on a stream in springtime at Swinbrook, the Cotswolds, UK

Female mallard duck with new ducklings, Anas platyrhynchos, strolling on garden patio in springtime at Swinbrook, the Cotswolds, UK

Female Canada Goose, Branta canadensis, with young goslings, on River Windrush at Swinbrook, the Cotswolds, UK

Moorhen's nest, with seven eggs laid, made with twigs among iris plants in a pond in Swinbrook, the Cotswolds, Oxfordshire, UK

Mallard ducks in lakeland countryside at Easedale Tarn lake in the Lake District National Park, Cumbria, UK

Pear tree in blossom in Southrop in the Cotswolds, Gloucestershire, UK

Moorhen's nest, with seven eggs laid, made with twigs among iris plants in a pond in Swinbrook, the Cotswolds, Oxfordshire, UK

Moorhen's nest, with seven eggs laid, made with twigs among iris plants in a pond in Swinbrook, the Cotswolds, Oxfordshire, UK

Female mallard duck with new ducklings, Anas platyrhynchos, on a stream in springtime at Swinbrook, the Cotswolds, UK

Pink-footed Geese migration, Holkham, Norfolk. Migrating birds could risk Avian Flu (Bird Flu Virus)

Migrating Pink-Footed geese over-wintering at Holkham, North Norfolk coast, East Anglia, Eastern England

Migrating Pink-Footed geese over-wintering on marshland at Holkham, North Norfolk coast, East Anglia, Eastern England

Pink-footed Geese migration, Holkham, Norfolk. Migrating birds could risk Avian Flu (Bird Flu Virus)

Migrating Pink-Footed geese over-wintering on marshland at Holkham, North Norfolk coast, East Anglia, Eastern England

Migrating Pink-Footed geese over-wintering at Holkham, North Norfolk coast, East Anglia, Eastern England

Brent geese, Branta (bernicla) bernicla, in the saltmarshes in Holkham, North Norfolk, UK

Brent geese, Branta (bernicla) bernicla, in the saltmarshes in Holkham, North Norfolk, UK

Pink-footed geese in the sky at sunset over Holkham saltmarshes, North Norfolk, UK

Migrating Pink-Footed geese over-wintering at Holkham, North Norfolk coast, East Anglia, Eastern England

Migrating Pink-Footed geese over-wintering on marshland at Holkham, North Norfolk coast, East Anglia, Eastern England

Migrating Pink-Footed geese over-wintering at Holkham, North Norfolk coast, East Anglia, Eastern England

Graylag geese, Anser anser, on Tarn Hows lake, in the Lake District National Park, Cumbria, UK

Migrating Pink-Footed geese over-wintering at Holkham, North Norfolk coast, East Anglia, Eastern England

Pink-footed geese in the sky at sunset at Burnham Thorpe near Holkham, North Norfolk, UK

Pink-footed geese in the sky at sunset over Holkham saltmarshes, North Norfolk, UK

Migrating Pink-Footed geese over-wintering on marshland at Holkham, North Norfolk coast, East Anglia, Eastern England

Graylag goose, Anser anser, on Tarn Hows lake, in the Lake District National Park, Cumbria, UK

Teal Duck in pond North Norfolk, UK