Why birds do not get electric current when they sit on electric wire?

In order for electricity to shock something it needs to be touching the ground. Electricity goes through the body and back into the ground. Since the crow is in no way touching the ground the electricity has no where to go and thus can not shock the crow. If you touch the wire and are not touching anything that conducts electricity (like metal) and are not touching the ground you will not get shocked either. But if you stand on the ground and touch the wire you will get shocked.