If you think Wikipedia is a good idea, you might also want to look at the Encyclopedia of Life. This is an online collaborative project to document all living species. If short on taxonomic skills, you might still be able to enjoy and perhaps contribute to the photo archive. Here’s looking at you, kid.
Photograph of the eye of a European Green Toad, Bufo viridis, © Matt Reinbold via the Encyclopedia of Life media image page.