Gorilla Kept Stacking Tires Every Morning, Then His Caretaker Finally Figured Out Why

A Clue Unearthed

Angie replayed the tape, trying to pick out what could have triggered such a strong response. Was it another animal’s call? Human voices? Machinery?

She realized she’d stumbled onto something important. “This is it,” she whispered. Whatever was on that tape was the key to understanding Boba’s heartache.