Hear audio of mouse lemurs and pied babblers (Note: Lemur calls have been slowed down to one-tenth their speed so that scientists can analyze their differences.) Behold the World's Smallest Monkey ...

And one of the newest among the colossal critter coterie that calls spacious spread home? We're feeling every heartstring tugged in unison: It's Arlo, a baby ring-tailed lemur. THE BABY'S BIRTH ...