[Tweeters] Black Jacobin (hummingbird), appeared to have portions of its song that were ultrasonic, “inaudible to humans,”————Higher calling | Washington State Magazine | Washington State University

Dan Reiff, PhD dan.owl.reiff at gmail.com
Sat Sep 15 00:53:08 PDT 2018



https://magazine.wsu.edu/2018/08/06/higher-calling/


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