Howler Monkeys With Deeper Voices Have Smaller Balls (And Vice Versa) 

Howler monkeys are loud. (If you doubt me, just click on the video and listen.) They can bring on the noise because they have a built-in amplifier: a huge cup-shaped throat bone that resonates to their song. But a study up in today’s Current Biology suggests that the males with the biggest voices also have the… »10/22/15 12:12pm10/22/15 12:12pm