Anthony Di Fiore writes in the NY Times "Notes from the field" feature about his work with spider monkeys in Ecuador: "Spider monkey fathers and sons".
One trick we’ve learned for locating samples is to listen for the buzz of a shiny emerald dung beetle, since they often find a fresh sample within a few moments of it hitting the ground. Conveniently, the dung beetles sometimes roll up a nice bolus of poop, kicking out embedded seeds, which we then shamelessly steal.