Ladybug

The Lady bug (Coccinellidae) is probably the best friend a gardener can have. They have no cons, only pros. They eat only bad insects and sip some nectar, and they will police tirelessly until all pests are gone, stopping periodically to mate.
We had an early aphid infestation on our Autumn Clematis (clematis peniculata) this year, but we are trying really hard to cut out pesticides and other chemicals in our yard.

We ordered 1500 Ladybugs from the internet and a couple of days later we had a box of Ladybugs! We released them as per the instructions. A couple of days later, they were all gone. So we ordered 4000 the next time. When I released them, they hung around long enough to mate and completely eliminate the aphids after a few days!