Editing Psittacus (section)

=== Vocalisation ===
Wild grey parrots often whistle, click, or make other sounds. A grey's owner should expect to hear regular renditions of microwave ovens, telephones, alarm clocks, video games, and other electronic sounds, as well as dripping water, wild birds, and any other sound often heard by the parrot. Greys have even been known to repeat the profanity they heard from an owner even after they no longer live with that owner. Greys also have the ability to mimic, and distinguish between, the different voices they hear.  Grey parrots use different alarm calls for different predators coming their way.<ref>{{cite journal|last=Giret|first=Nicolas |display-authors=etal |title=Context-related vocalizations in African grey parrots (Psittacus erithacus)|journal=Acta Ethologica|date=April 2012|volume=15|issue=1|pages=39–46|doi=10.1007/s10211-011-0106-9|s2cid=18208971 }}</ref>[[File:Psittacus erithacus making some noise.ogg|left|Shrieking and clicking of the grey parrot]]

In an experiment to test the vocalizations of grey parrots, four bred in captivity were placed in an aviary. Throughout the day they spent time in a room with toys and came into fairly regular contact with the humans taking care of them. The noises that these parrots could hear consisted of the calls of canaries in the laboratory, people cleaning, doors squeaking, etc. In the next 3 years, the parrots made over 50,000 vocalisations. What was interesting was that, although they were bred in captivity, the sounds they made were not only ones of their immediate surroundings. They also made calls similar to those of other captive grey parrots in different locations and even wild grey parrots.<ref>{{cite journal|last=Giret|first=Nicholas |author2=Albert, Nagle |author3=Kreutzer, Bovet|title=Context-related vocalizations in African grey parrots (Psittacus erithacus)|journal=Acta Ethologica |date=April 2012|volume=15|issue=1|pages=39–46|doi=10.1007/s10211-011-0106-9|s2cid=18208971 }}</ref>