Table 1. Strix specimen data.

We here provide further information regarding the datasets that archive the Strix specimens to which we refer throughout the manuscript.

Specimen	Data publisher	Date accessed	Link to dataset
CAS:ORN:95964	CAS Ornithology (ORN), California Academy of Sciences, San Francisco, California, United States of America	2016 Aug 15	http://ipt.calacademy.org:8080/ipt/resource.do?r=orn
CAS:ORN:98821	CAS Ornithology (ORN), California Academy of Sciences, San Francisco, California, United States of America	2016 Aug 15	http://ipt.calacademy.org:8080/ipt/resource.do?r=orn
CNHM<USA-OH>:ORNITH:B41533	Museum of Natural History & Science, Cincinnati Museum Center, Cincinnati, Ohio, United States of America	2017 Sep 3	https://www.idigbio.org/portal/records/57d299f0-2cc7-44f7-aa5f-3c2ea175e757