There are many, many conservation advocacy groups are on the Web. These appear both representative and reputable.
Animals: Conservation

Bat Conservation
Find out why bats will not get tangled in your hair at Batcon, i.e., Bat Conservation. learn more

Ocean Conservancy
Ocean Conservancy is working with you to protect the ocean from today’s greatest challenges. learn more

Smithsonian National Zoo - Education
At the Smithsonian National Zoo's website, you can solve jigsaw puzzles and crossword puzzles, take a virtual world tour, send an e-card, and learn about animals and their names. Explore a variety of educational programming for people of all ages through at-home activities, classes, school programs, webinars, and more. Undergraduate, graduate and professional training are… learn more

World Wildlife Foundation
The World Wildlife Fund (same as the World Wide Fund for Nature) is the premier organization for conservation of wildlife. The site includes a newsroom, publications and research, expert's database, photo gallery and sights and sounds, resources for kids and teachers, and a tip of the day. Kids will especially like the animal sounds pages. learn more

Worm Woman
Learn more than you ever imagined about the role of worms in soil conservation at Worm Woman. learn more