In forest ecology, a snag refers to a standing, partly or completely dead tree, often missing a top or most of the smaller branches, which becomes crucial habitat for many woodland creatures. While common in the wild, snags are often removed from cities.
As I was rushing around town before thanksgiving, I was lucky enough to catch Growing Concerns on the radio. Cecillia Nasti had a great episode on giving thanks to our planet through earthcare and wildscaping. Have a listen here at kut.org.