One of the more dynamic ecosystems, pinon and juniper woodlands display many diverse facets of species interactions. During two walks you will encounter multiple levels of ecology, from the pervasive, microscopic crypto-biotic crusts to the global scale of climatic variation. Discuss the interplay of human-induced change, drought, fire, competition and cooperation between pinons and junipers, episodic outbreaks of insects, and why this ecosystem is the most sensitive to small variations in moisture and temperature. Students will provide their own transportation. Bring water and your lunch.