Awesome Adaptation--Howler Hyoid Bone

While the official title is debatable the accolade of "World's Loudest Animal" just may go to the Howler Monkey of Central and South America--can be heard three miles away in dense jungle.  Imagine yelling to a friend from that far away--can't even do that across a parking lot!  Here's how and here's what will blow your ever-loving mind.  What an awesome adaptation!  Take your time admiring how the hyoid bone has been modified and engorged in the Howler.

Now compare to the Howler's: