World
A scientist's 4-decade quest to save the biggest monkey in the Americas

CARATINGA, Brazil: The emerald-green canopy shifts and rustles as a troop of willowy, golden-gray monkeys slides through a tropical ecosystem more threatened than the Amazon.

Karen Strier started studying the biggest monkey in the Americas four decades ago, when there were just 50 of the animals left in this swath of the Atlantic forest, in southeastern Brazil's Minas Gerais state.