When viewing a Dragonfly in flight through a high powered zoom (if they hover in one spot long enough to get on focus, not very often!) their whole bodies vibrate so rapidly because of wing movement that it is hard to believe that they can fly so efficiently and pinpoint prey with such accuracy, they are amazing creatures.
The Australian emerald, is a species of dragonfly in the family Corduliidae. It is native to Australia. Its appearance is very similar to the tau emerald.