If you've ever been around chickens, you know they're usually relatively quiet. You might hear some squawking and bickering within the brood, but it's not constant noise like some animals make. But ...

When it comes to natural talent, vocal birds are where it's at. As animals, we probably underestimate (and shouldn't) that their intelligence and vocabularies keep evolving in the most impressive ways ...

Source: Christopher Michel, via Wikimedia Commons. Distributed under a CC BY 2.0 license. Whale song is largely considered to be a display of reproductive fitness, akin to the melodies produced by ...