.dropcap { color: #838078; float: left; font-size: 82px; line-height: 60px; padding: 5px 8px 0 0; } Maria de los Angeles Azuara couldn’t hold back tears when she heard two dozen children singing at a small school in the Mexican state of Chiapas. Guided by their music teacher, the elementary students performed a song they’d adapted about a new friend, a young Golden-cheeked Warbler named Chipilo who lived in the same mountains they did. He connected them, they sang, with “the only world that can cover us both / the world in which we all live.” The children sang in Spanish—the second language of their Indigenous Tsotsil Mayan community. It was 2015, and only a couple of months had passed since Azuara and colleagues had started working with 28 teachers from several Indigenous schools in Chiapas. As the environmental education program director at the non-profit Pronatura Sur, her job was to convince teachers to include a children’s book called The...