Founded 1889 – Affiliated to Yorkshire Naturalists' Union

Amphibians and Reptiles:
British Herpetological SocietyFroglife
British Reptiles
Bats:
The Bat Conservation TrustNorth Yorkshire Bat Group
East Yorkshire Bat Group
Birds:
Scarborough BirdersFiley Brigg Ornithological Group
Flamborough Ornithological GroupRSPB
British Ornothologists UnionBritish Trust for Ornothology
Wildfowl and Wetland TrustHawk and Owl Trust
North Yorkshire Coast Swift Group
Butterflies and Moths:
Butterfly ConservationYorkshire Branch of Butterfly Conservation
Fungi and Lichens:
The British Mycological SocietyThe British Lichen Society
Geology:
Dinosaur CoastYorkshire Geological Society
Rotunda MuseumRotunda Geology Group
Insects and Spiders:
Amateur Entomological SocietyBuglife
Royal Entomological SocietyThe British Dragonfly Society
Yorkshire Branch of BDSBritish Arachnological Society
Bumble Bee Conservation Trust
Mammals:
The Mammal SocietyYorkshire Mammal Group
The Badger TrustNorth Riding Badger Group
Marine Life:
Marine Biological AssociationMarine Biological Conservation Society
Scarborough SeaLife and Marine Conservation Sanctuary
Molluscs:
Conchological Soc Of Great Britain and Ireland
Plants:
Botanical Society of the British IslesPlantlife
The Tree CouncilThe Forestry Commission
The Woodland TrustThe British Bryological Society
General:
The Cayton and Flixton Carrs Wetland ProjectThe Biological Records Centre
DEFRAMapmate
The North and East Yorkshire Ecological Data CentreThe Yorkshire Naturalists' Union
The Yorkshire Wildlife Trust:Ryedale Natural History Society