Here you go:

"That thankless task fell to Aleksey Maro, a UCB graduate student who spent last summer in Ngogo, sleeping in trees—protected from the constant streams by an umbrella—to collect urine samples. Sharifah Namaganda, an Ugandan graduate student at the University of Michigan, showed him how to make shallow bowls out of plastic bags hung on forked twigs for more efficient collection. He also collected samples from puddles of urine on the forest floor."

https://arstechnica.com/science/2026/02/boozy-chimps-fail-urine-test-confirm-hotly-debated-theory/