This document provides an introduction and overview of the Butterfly Environmental Release Decision Chart, which indicates whether specific butterfly species can be released into the environment in different US states and territories. It explains that the chart lists 9 butterfly species that may be considered for environmental release across the top and US states/territories down the left side, with "yes" or "no" responses for each species/location combination. Any asterisks next to "yes" responses should be checked against footnotes. The document includes screenshots of the chart and notes on its use.