The “squeak” call is of great interest to researchers because this is the special vocalisation made at a distance from the colony when a bird encounters a good foraging area. When this call is heard, large groups of their colony "neighbours" will arrive at the location. This "squeak" call is used greatly during bad weather conditions. For this specific call, the cliff swallows are one of the few known vertebrates to make a “competitively disadvantageous” cue to their peers for food availability.