MARTIN: There's no such thing as a free lunch - even honeybees have to earn their keep as they flit from one meal to the next. Flowers provide them with nectar, and in exchange, the bees spread pollen from one plant to another.

Now, new research shows that honeybees do even more to earn their lunch than previously thought.

MARTIN: According to scientists from the University of Wurzburg, honeybees act as plant bodyguards by scaring away caterpillars that would otherwise munch on the plants' leaves.

Honeybees aren't actually dangerous to caterpillars, but wasps are. And the caterpillars – using fine hairs on their bodies to detect flying insects - can't tell the difference - so they keep away from areas with large honeybee populations. In fact, in lab experiments, the scientists found that when honeybees are around, caterpillars do 60 to 70 percent less damage to plant leaves.

The researchers hope their discovery will soon be applied to sustainable farming practices. If crops and flowers are grown side by side in the same field, then honeybees attracted to the flowers will become crop protectors – allowing farmers to use fewer chemical pesticides.

And that's an idea that's worth some buzz.

MARTIN: That's this week's note on emerging science. I'm Jessie Martin.

CURWOOD: Coming up – a corny look at seed art. Keep listening to Living on Earth.