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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

If I buy you lunch today, chances are you'll pick up the tab next time. We humans reciprocate a lot,

days, weeks, or even months later. And other primates do it too. Monkeys that are more generous

with food, for example, enjoy more grooming from their peers, and they're more

likely to get back up later on in a fight. Now a new study suggests a non-primate, the dwarf

mongoose, also makes cooperative, time-delayed barters, trading grooming for guard duty.

Here's how it works. When an individual is on Sentinel, they are basically on guard duty for the rest of the group.

Julie Kern, a behavioral ecologist at the University of Bristol.

So they will choose an elevated position such as a tree or a termite mound from which to sit

and then they watch out for predators that might be coming in to target the group, and then they'll give

alarm calls to warn the rest of the groups.

But throughout the watch, they also remind everyone else they're on lookout with softer

surveillance calls, so any mongooses hunting for bugs can keep calm and carry on.

What Kern and her colleagues observed in the wild was that mongooses who took those lookout

shifts also enjoyed more grooming back at the borough.

Then to establish cause and effect, they played recordings of certain mongoose individuals

making surveillance calls, in effect, tricking the mongoose's peers into thinking it was on guard duty.

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