Male sparrows are less intimidated by the songs of aging rivals

Few singers reach their sunset years with the same voice they had in younger days. Singing sparrows are no different. Duke University-led research reveals that elderly swamp sparrows don't sound quite like they used to—nor do they strike the same fear in other males who may be listening in.

from Phys.org - latest science and technology news stories https://ift.tt/2NSNlyT

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