Project Noah has a section titled Missions in which you can find projects that you can contribute to. The Missions ask people to make contributions of images and observations about a specific animal, plant, or region. I've just joined the Flowers of North America mission to share the pictures of flowers blooming along stream banks that I will take while fly fishing this spring.
Applications for Education
Project Noah has an Education section in which teachers can register their classrooms. Once registered teachers can assign Missions to their students and track their students' observations.
