From:    Wolftrail 
Subject: ecovolunteer projects

about ecovolunteer projects all over the world.

The website offers many wildlife conservation and research projects all
over the world. The projects involve many different species: monk seals,
wolves, griffon vultures, black rhinos, white rhinos, colobus monkeys,
bush babies, gibbons, several species of macaques, bats, macaws, marine
turtles, dolphins, whales, etc. The projects are available for direct
participation by students and holidaymakers. The website offers separate
pages of information about each project and additionally the opportunity
to freely download extensive files on each project and species.
All projects are operated by local conservation and research
organizations and the costs for participation are minimal.

So please have a look at:
http://www.ecovolunteer.orgel/