Founded in 1826, the Zoological Society of London (ZSL) is an international scientific, conservation and educational charity whose mission is to promote and achieve the worldwide conservation of animals and their habitats. It runs the Institute of Zoology, conservation projects in more than 50 countries, and two Zoos, ZSL London Zoo and ZSL Whipsnade Zoo

The Zoological Society of Glasgow was founded on 14th December 1936 by Edward Hindle, who was a professor of zoology at the University of Glasgow. Its name was later changed to the Zoological Society of Glasgow and West of Scotland.

The Wildlife Conservation Society (WCS) is a non-governmental organisation headquartered at the Bronx Zoo in New York City, that aims to conserve the world's largest wild places in 14 priority regions. Founded in 1895 as the New York Zoological Society (NYZS), the global conservation organisation manages four New York City wildlife parks in addition to the Bronx Zoo: the Central Park Zoo, New York Aquarium, Prospect Park Zoo and Queens Zoo

The Wildfowl & Wetlands Trust (WWT) is an international wildfowl wetland conservation charity in the United Kingdom.

The trust was founded in 1946 by the ornithologist and artist Sir Peter Scott as the Severn Wildlife Trust.

The first site at Slimbridge was a centre for research and conservation. In a move unusual at the time, he opened the site to the public so that everyone could enjoy access to nature.

This organisation later developed into the Wildfowl & Wetlands Trust, the only United Kingdom charity dedicated solely to promoting the protection of wetland birds and their habitats

The Nature Conservancy is a global environmental organisation headquartered in Arlington, Virginia. The Nature Conservancy developed out of a scholarly organisation initially known as the Ecological Society of America

The British Trust for Ornithology is an organisation founded in 1932 for the study of birds in the British Isles. Max Nicholson was the first treasurer, Bernard Tucker was the secretary and Harry Witherby was an early benefactor and vice-chairman

Antwerp Zoo is a zoo in the centre of Antwerp, Belgium, located next to the Antwerpen-Centraal railway station. It is the oldest animal park in the country, and one of the oldest in the world. Since its foundation, the park has been controlled by De Koninklijke Maarschappil voor Dierkunde van Antwerpen, a society originally called the a society originally called Société Royale de Zoologie d'Anvers (The Antwerp Royal Society for Zoology). Its first director was renowned zoologist and botanist Jacques Kets. He accepted this position on one condition: a museum had to be built to house his nature-historical collections. This building was inaugurated in 1944 by H.M. King Leopold I