Nature's Exotic Athletes - Strange Animal Sports http://webecoist.com/2009/09/04/natures-exotic-athletes-12-strange-animal-sports/

ARKive - Images of Life on Earth (Noah's Ark for the internet - includes videos, images and fact files) http://www.arkive.org/

The Gould Group.
Three Victorian Zoo's site.
International Union of Conservation of Nature
Ready Education Kid's World
Department of Sustainability and Environment (Australia).

Invasive Species - Australia's Feral Future
Best place to find free-to-use pictures is on Flickr (http://www.flickr.com/) Make sure you go to Advanced Search and check "Creative Commons"
Find images in the "Rogue's Gallery" - http://www.invasives.org.au/photos.html
Feral animals in Australia for Kids http://www.kidcyber.com.au/topics/ferals.htm
Feral Feast - Library Think Quest http://library.thinkquest.org/03oct/00128/en/main.htm
Feral.org.au http://www.feral.org.au/content/species/species.cfm
Pest management from the CSIRO - http://www.csiro.au/org/PestManagementOverview.html
Australian government site (general information) http://www.environment.gov.au/biodiversity/invasive/ferals/index.html
Invasive species in Australia (Wikipedia) http://en.wikipedia.org/wiki/Invasive_species_in_Australia