Every year, we go to the river, and we see new animals each time. With my second grader-to-be interested in animals and writing about them, I decided it was time we learned about the animals we were looking at. There is very little information out there in the form a young child can digest (even the library let us down), so I took info from Wikipedia.com and put it into a less intimidating format. I also made worksheets with questions they have to answer about the animals they are researching.
You can find more at Suburbamom at Teachers Pay Teachers.
The seven year olds loved these! We found these are even more fun to do collaboratively!