The White-naped swift (Streptoprocne semicollaris), is the largest representative species of swift in the New World and one of the two largest species the world. Only the purple needletail of Asia may be slightly larger. This bird is found principally in western and central Mexico, with one record on the Guatemalan border. This swift is normally silent when seen solitary and noisy when encountered in a group. The call is described as cree-cree-cree. The call is delivered both while in flight and while perched on the walls of the nesting cave.