The best single source of web links to sites that feature animal and environmental issues is Envirolink at www.envirolink.org. Envirolink maintains home pages for a number of organizations, plus acts as an extensive clearing house for research material, events, citizen action, and the like. The Animal Rights Resource Site is one of the best.
Here are some of the best lists:
Envirolink's Home
Page List
Animal Rights Site List
Miscellaneous Sites with Animal Issues
Animal Welfare/Rescue Organizations
And if you really like large lists, try the following:
Enormous List of Environmental Groups
We would also like to give special mention to the following sites, which are doing an outstanding job of promoting animal rights and publicizing current animal issues.
The Mining Company - Animal Rights
The Animal Protection Institute