You can join observers across the nation in collecting phenology data on hundreds of species of plants and animals through the USA National Phenology Network’s Nature’s Notebook program. Nature’s Notebook, a national plant and animal phenology observation program, is appropriate for scientists and non-scientists alike. Observations follow scientifically rigorous protocols, are entered in the national phenology database maintained by the USA National Phenology Network (USA-NPN), and are made freely available for query, visualization, and download on the USA-NPN Web site. http://www.usanpn.org/participate