Northern Flicker The Neighborhood Woodpecker

In Calgary, and I'm sure this might be similar in other cities, we have many neighborhood northern flickers. They seem well adapted to living among houses, telephone poles, and trees. When I hear the high-pitched squeak they make, I know there is one nearby. Sometimes when they are pecking away at something metal, there is also a distinct sound that might sound like a jackhammer or drill on metal, but the rapid-fire tapping is this little woodpecker trying to make some holes.