UK Bird Observatories:
Bird Observatories Council
Bardsey Island Bird Observatory
Calf of Man Bird Observatory
Cape Clear Bird Observatory
Copeland Bird Observatory
Dungeness Bird Observatory
Fair Isle Bird Observatory
Filey Bird Observatory
Holme Bird Observatory
Isle of May Bird Observatory
Landguard Bird Observatory
North Ronaldsay Bird Observatory
Portland Bird Observatory
Sandwich Bay Bird Observatory
Skokholm & Skomer
Spurn Bird Observatory
Local websites
George Stoyle / Earth In Focus
Yorkshire Coast Nature
Flamborough wildlife group
Steve Race photography
RSPB East Yorkshire group
RSPB Bempton Cliffs
Buckton Birder
Yorkshire Wildlife Trust
YWT Living Seas Centre
Yorkshire Naturalists Union