In American suburbia, this animal was formerly quite common. Not anymore.
The reason it is not common anymore is that there are no insects for it to catch in the night sky. In our obsession to achieve the perfect lawns, we have killed the insects with the broad-spectrum insecticides. In the food web of the terrestrial ecosystem, the Common Nighthawk is a secondary consumer, eating the insects (primary consumers) that eat the plants, which are the primary consumers.