What are human murmurations, I wondered? They are, speaking of choruses, in Horton Hears a Who, the tiny Whos of Whoville, who find that if every last one of them raises their voice, they become loud enough to save their home. They are a million-and-a-half young people across the globe, on March 15, 2019, protesting climate change; coalitions led by First Nations people, holding back fossil fuel pipelines across Canada; the lawyers and others who converged on airports all over the US on January 29, 2017, to protest the Muslim ban.