This activity can be one year-round, but is especially great to deal with cabin fever and get some short time outdoors. This download now includes six sorting circles to organize by growth type and more ideas to teach about biodiversity, ecosystems, and bio-engineering. Take this guide outside with you when you go hiking or exploring. Or gather lichen from fallen sticks and twigs to study indoors. (Leave lichen on living trees alone, as removal may disrupt the ecosystem.) Return species to where you found them, or if you want to keep them, keep them dry in a cardboard box. Note that some wildlife refuges have a no collecting policy, but lichen is easy to find anywhere! We recommend six laminated guides for a class of 24.