National Geographic : 1945 Feb
© National Geographic Society 'ainting oywaner a.vec Black Howler Monkeys in a Treetop Watch a Flight of Yellow-headed Amazons, WildBrothers ofPet-store Parrots On both male and female howler, a bushy beard conceals a thin-walled, globelike bone which acts as an amplifier. Apack in"song" sounds likeamoving freight train. A lone howler, like the Western coyote, is often mistaken for a dozen. Shattering La Venta's stillness, howlers' voices carried amile ormore. They have prehensile tails-tenacious and dexterous-found in three groups of American monkeys. No Old World monkey uses thetailasa"fifth hand."