This is a really good site to use in school. Each term there is a project/task to do in your school grounds (mainly primary based but can be adapted for Secondary/SEN. I.e. building log piles/ insect homes. My KS3 tutor group have a bird identity chart  & look after the feeders. (Sometimes there are difficulties getting past the caretaker to implement these tasks, be prepared e.g. planting trees!)