FUN FACT: 

These lemurs have a very loud warning system.  When a predator is nearby, they use an elaborate series of barks and calls to alert other lemurs in the area to the threat.  These newly alerted lemurs will then take up the warning call as well until all those in the area are aware of the danger.  The warning call will vary depending on whether the threat is on the ground, in the air, or in a tree.