ABC - African Bird Club

AFO - Association of Field Ornithologist

American Birding Association

BirdLife International

Bird Links to the World

BOC - British Ornithologists' Club

BOCA - Bird Observation & Conservation Australia

BOU - British Ornithologists' Union

BTO - British Trust for Ornithology

C.I.R.

CMS - Convention on Migratory Species

Cooper Ornithological Society

Cormorant Research Group

CSO - Czech Society for Ornithology

Dansk Ornitologisk Forening

DO-G - Deutsche Ornithologen-Gesellschaft

Dutch Birding

EBCC – European Bird Census Council

ECWG - European Crane Working Group

EURAPMON - Research and monitoring for and with raptors in Europe

EURING - European Union for Bird Ringing

European Crane Working Group

Gull Research Organisation

IUCN World Conservation Union

IWSG - International Wader Study Group

London's Swifts Homepage

NBC - Neotropical Bird Club

Oiseaux.net

Owling.com

Ramsar Convention on Wetlands

Raptor Research

Raptor Research Foundation

RSPB

SEO

SKOF - Skanes Ornitologiska Forening

SON - Sociedad de Ornitología Neotropical

STONE

Surfbirds The World Birding Website

Swiss Ornithological Institute

The American Ornithologists' Union

The European Ornithologists' Union

The International Owl Society

The Owl Pages

The Ramsar Convention on Wetlands

The Wilson Ornithological Society

The World of Owls

Wader Study Group

Western Field Ornithologists

Wetlands International

World Owl Trust