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This is Scientific American's 60-second science.

I'm Christopher in Taliatta.

The hardest part of chasing monkeys through the jungle isn't the snakes.

The snakes, they are not going to attack you if you don't have contact with them.

It's simply keeping up with the monkeys.

They are jumping from one tree to another tree, so they don't care if the landscape is difficult or if there is a river.

Jose Domingo Ordonez-Gomez. He's a primatologist at the German primate center in Göttingen.

The reason he was pursuing 35 spider monkeys through the rainforests of southern Mexico was to record

their winnies.

By analyzing more than 500 calls, he found that when a monkey was separated from the group

by more than 40 meters or 130 feet, it produced a lower-pitched call than when the same monkey

was nearby the group. Rodonias Gomez thinks the pitch choice may be because

lower frequency calls are better suited to travel long distances through Dunce Jungle.

The findings are in the journal Plus One.

Rodonias Gomez also found that other spider monkeys responded back more quickly

when they heard one of the low-pitch calls compared to a regular

...