The monkeys would rip-off the tokens at every available opportunity — from each other, often from us — you know, things we didn't necessarily think we were introducing, but things we spontaneously saw.
Они тырили жетоны при первой удобной возможности — у друг друга, часто и у нас — вот с этими понятиями мы точно их не знакомили, но часто их наблюдали.