• Herts Bird Club 
• Herts Moth Group
• Butterfly Conservation, Herts and Middlesex Branch 
• Herts & Middlesex Wildlife Trust 
• Hertfordshire Biological Records Centre
• Hertfordshire Countryside Management Service
• RSPB Hitchin & Letchworth Group
• RSPB St Albans Group
• RSPB Watford Group
• Rye Meads Ringing Group
• St Albans Watercress Wildlife Association
• Watford Coleoptera Group (Beetles)
• Friends of Tring Reservoir
• Great Groves in Broxbourne Woods
• Hertfordshire Orchard Initiative
• Marshalls Heath Nature Reserve
• Stort Valley Wild

County natural history societies

• Bedfordshire NHS
• Cambridge NHS and Nature in Cambridge
• Essex Field Club
• London NHS
• Suffolk Naturalists' Society

National organisations

• Bat Conservation Trust
• Bees, Wasps and Ants Recording Society
• Botanical Society of the British Isles
• British Entomological and Natural History Society
• British Trust for Ornithology
• Butterfly Conservation
• Defra Department for Environment, Food and Rural Affairs
• Hoverfly Recording Scheme
• Mammal Society
• National Biodiversity Network
• National Federation of Badger Groups
• National Federation for Biological Recording
• Natural England
• Pond Conservation
• Royal Entomological Society
• Royal Society for the Protection of Birds
• National Trust (nature pages)
• UK Ladybird Society
• UK Phenology Network
• Wildfowl & Wetlands Trust
• Wildlife Trusts Partnership
• Woodland Trust

Various wildlife sites

• Bat Conservation International
• UK Birdwatching Links
• Frog Life
• London Bat Group
• London Natural History Society
• London Wildlife Trust
• Moths & Butterflies of Europe
• Raptor Conservation
• South East Bird News
• UK Moths
• World Wildlife Fund