Seven hundred thousand ladybirds have been put out around two housing estates in New York. This is because there is a huge aphid problem there. The bugs were chosen because they won't move into homes and they can can each eat 50 aphids a day.
One of the helpers, called Eric Vinje, said, "In most cases, we reach for a can of pesticide - and we kill not only the 'bad guys,' but the 'good guys.
"All we're doing here is putting more of the 'good guys' to tip the scale, to get some kind of pest population control."
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