Sussex Organisations and Groups
- Butterfly Conservation - Sussex Branch
- RSPB - East Sussex Groups
- RSPB - West Sussex Groups
- South Downs National Park
- Sussex Biodiversity Records Centre
- Sussex Botanical Recording Society
- Sussex Nature Focus
- Sussex Ornithological Society
- Sussex Wildlife Trust
- Sussex Wildlife Trust - Eastbourne Local Group
- Sussex Amphibian and Reptile Group
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
- National Trust (nature pages)
- Natural England
- Pond Conservation
- Royal Entomological Society
- Royal Society for the Protection of Birds
- Wildflower Society
- The Wildlife Trusts
- Wildfowl & Wetlands Trust
- Wildlife Trusts Partnership
- Woodland Trust
- UK Ladybird Society
- UK Phenology Network (Nature's Calendar)
Various wildlife sites
- Bat Conservation International
- Frog Life
- Moths & Butterflies of Europe
- South East Bird News
- Wild about Britain
- World Wildlife Fund
- UK Butterflies
- UK Moths