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This is Scientific American 60 Second Science. I'm Suzanne Bard.

Like many birds, male white-throated sparrows

belt out songs to defend their territories

and attract mates.

And until the year 2000, one particular song stood out as the most popular white throat tune in forests

across Canada.

The end part of the song is a three-syllable repeat. That's supposed to sound like,

Oh my sweet Canada, Canada, Canada.

University of Northern British Columbia, behavioral ecologist Ken Otter.

And if you look in most books that describe what the song sounds like, it always has a three

syllable phrase at the end of it.

But when Otter moved to Prince George, a wooded city in Western Canada 20 years ago, he noticed

that its sparrows were singing a different tune.

...