Ontario
You have one of the meadowhawk dragonflies. It could be the ruby, red-veined, or maybe the cherry-faced meadowhawk ...not sure without photos from other angles.
Dragonfly Id is not easy. It is usually necessary to have photos of the side, face and tail to know the species....and they do not usually sit still for a thorough photo oppt :-)
Here are photos of the various ones - http://bugguide.net/node/view/522/bgpage?from=5
Most dragonflies are found thru out North America near water.
Adult dragonflies are predators or good bugs as they feed on other insects. The nymphs of dragonflies live in water feeding on small insects like mosquito larvae.
