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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.

The winter edition includes: Genes and addiction, 30 years of student service, why humanities matter, top five dinosaur myths and more.

U biologist Nitin Phadnis’ new study shows how species arise.

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.