For teachers interested in citizen science curriculum, the Cornell Lab of Ornithology has a program called BirdSleuth. It is linked to the lab's Citizen Science projects, and currently, it offers curriculum for grades 1-10 (something for older students is being tested now).
This looks like a great way to combine learning and an experience of nature. Follow the link above for more information. Below, you can watch the lab's promotional video about children learning bird-watching skills and becoming citizen scientists.