http://www.abdn.ac.uk/mammal
Mammal Society: A membership organisation with a Youth Section. Free fact sheets on native mammal species can be downloaded. Online activities. A section on endangered species includes surveys of numbers and explanations of the causes of extinction.

http://www.foe.co.uk
Friends of the Earth: A campaigning organisation with local and international campaigns, e.g. preventing open cast coal mining which is causing habitat destruction.
International campaigns can be found at: http://www.foei.org

http://www.greenpeace.org
Greenpeace: Campaigning organisation with information on habitat protection.

http://www.wwf-uk.org
Worldwide Fund for Nature: Information about national and international campaigns to protect endangered species. There is an interactive learning site at: www.wwflearning.co.uk
Join in the debates.

http://www.safaripark.co.uk
Safari Parks.co.uk: A listing of UK safari and zoo parks with background information about animals.

http://www.environment-agency.gov.uk/yourenv/education/?version=1
Environment Agency: Download a teacher resource pack.

http://www.english-nature.org.uk
English Nature: Information on regional concerns over development. Details of nature reserves in your region.

http://www.ex.ac.uk/knotweed
Japanese Knotweed Control Forum for Cornwall: Information on the plant and how to control it. Includes information for science teachers and the chance to take part in a national survey.