howler monkeys

Silencing the booming chorus

From 2007 to 2009, a yellow fever virus outbreak nearly decimated El Parque El Piñalito’s howler monkey populations. Exposure to a past virus may have aided brown howlers’ survival.


TWO ROUTES FOR MONKEY LOVE

Across the animal kingdom, males hoot and holler to attract females and ward off competing suitors, but howler monkeys evolve two sex tactics to pass on their genes.