Indri

When I was in Madagascar I was fortunate to have numerous experiences with the largest lemur in the world: the Indri (Indri indri).  At up to 80lbs they are a spectacular primate, but the coolest thing about them is their song!  I was able to record a troop singing near Andasibe National Park - the video (which doesn't actually contain any images of the lemurs) can be seen here:

http://www.youtube.com/watch?v=0GeBn0WAr4k&feature=youtu.be

So you know what you're listening to, here's a picture:

Indri (Indri indri)

Cheers!
Kyle