Alva Review-Courier -

WASHINGTON (AP) — Biologist Carlos Ruiz has spent a quarter-century working to save golden lion tamarins, the charismatic long-maned monkeys native to Brazil's Atlantic Forest.

Thanks to painstaking reforestation efforts, the population of these endangered monkeys was steadily growing until an outbreak of yellow fever hit Brazil in 2018, wiping out a third of the tamarins. Undeterred, Ruiz's team devised an ambitious new experiment: This spring, they would start vaccinating many of the remaining wild monkeys.

Enter the coronavirus, which is now hampering critical work to protect threatened spe...