This circuit generates a two-tone effect very much alike the cuckoo song. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. Agreeable, very close ...
Smithsonian Magazine on MSN
Birds Make an Alarm Call That Spans Species and Continents—and May Offer Insight Into the Evolution of Human Language
More than 20 species make a nearly identical noise to warn nearby birds of brood parasites, a behavior that bridges the ...
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