Swallow-tailed gull and hunting over the open oceans, and migrating eastward to the coasts of Ecuador and Peru. The swallow-tailed gull is unique among the gulls in feeding exclusively nocturnally, mostly on fish and squid which rise to the surface at night to feed on plankton. It leaves the colony as a flock at dusk, with a great deal of screaming and display. Calls and displays are quite different from other gulls, most resembling the vocalisations of the black-legged kittiwake and Sabine's gull. The loudest and most commonly heard call is an alarm referred to as "rattle-and-whistle", a gurgling scream made with
Fork-tailed drongo mimicked alarm calls to steal food from birds like pied babblers and animals such as meerkats. Tom Flower observed that fork-tailed drongos spend a quarter of their time following other animals. Drongos sometimes act as sentries when a predator is approaching, warning their neighbours with genuine alarm calls. But drongos also earn a quarter of their daily calories by sounding a false alarm when another animal finds food. When the meerkats and babblers flee from the non-existent predator, the drongo steals their food. Though in doubt, researchers have considered the possibility that these drongos possess theory of mind, not fully