In the time between the two assessments, the fungal disease white-nose syndrome became widespread in eastern North America, severely impacting the tricolored bat.[1] Historically, it was one of the most common bat species of eastern North America.[20] After an emergency assessment, the tricolored bat is considered an endangered species under the Committee on the Status of Endangered Wildlife in Canada as of 2012.[25] In 2016, the Center for Biological Diversity and Defenders of Wildlife submitted a petition to the United States Fish and Wildlife Service (USFWS) to list the tricolored bat under the Endangered Species Act of 1973.