Media type: E-Article Title: At the beginning of speciation Contributor: Jarvis, Erich D. imprint: American Association for the Advancement of Science (AAAS), 2021 Published in: Science Language: English DOI: 10.1126/science.abg5454 ISSN: 0036-8075; 1095-9203 Origination: Footnote: Description: <jats:p>Appearance and song are sexually selected factors to maintain a new bird species</jats:p>