Extended Data Fig. 1: Locations of monarch butterfly surveys on summer breeding grounds between 1994–2018.
From: Changes in climate drive recent monarch butterfly dynamics
Locations of surveys conducted between 14 Jun–15 Aug by the North American Butterfly Association (NABA; blue) and state-specific butterfly monitoring networks (BMNs; red) in a, 1994–2003 and b, 2004–2018. Counties (U.S.) and census districts (Canada) that are included in our delineation of the summer breeding range for the 1994–2003 reduced annual-cycle model and the 2004–2018 full annual-cycle model are outlined in grey.
