Walt disney Notebooks - The Little Mermaid

The Encyclopedia of Walt Disney's Animated Characters: From Mickey ratón to Hercules by
John Grant

Walt disney Character descripción of Iago from "Aladdin" (1992)

Jafar's sidekick is an irascible parrot, who - unusually for the birds - has teeth, and a lot of them at that. Hilariously voiced por Gilbert Gottfried at a general level of about one hundred decibles, Iago is as malicious as his master (although his character changed for The Return of Jafar). As is customary in the animated features, he is constantly being subjected to indignities por the one he serves - at one memorable stage he is deliberately trapped por Jafar in a sliding door - yet in this instance the slave is wiser than the master, for it is Iago who has the idea that Jafar's tactic to attain the sultanate should be through marrying Jasmine.