The endangered Geoffrey’s spider monkeys that dangle high in the rainforest canopy are elusive and hard for scientists to track. So biologist Jenna Lawson hid 350 audio monitors in trees across Costa ...

PUERTO JIMÉNEZ, Costa Rica — The endangered Geoffrey’s spider monkeys that dangle high in the rainforest canopy are elusive and hard for scientists to track. So biologist Jenna Lawson hid 350 audio ...